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PAU Graphic-Plastic Expression Techniques (Canary Islands) study materials
PAU Graphic-Plastic Expression Techniques (Canary Islands) study resources

PAU Graphic-Plastic Expression Techniques (Canary Islands) practice questions

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Question 1Graphic-plastic expression: materials, image-making and project evidence

What is the primary binder used in natural vine charcoal sticks (carbón vegetal)?

  1. Linseed oil mixed with mineral spirits
  2. Gum arabic dissolved in distilled water
  3. Beeswax combined with dammar resin
  4. No added chemical binder; it consists of pure charred wooden twigs Correct answer.

Explanation

Vine charcoal is produced by heating natural wooden twigs (typically willow or linden) in a airtight kiln without oxygen. Because it contains no added chemical binder, it remains exceptionally soft, friable, and easy to erase or smudge on paper.

Question 2Graphic-plastic expression: materials, image-making and project evidence

How is the hardness scale of graphite pencils determined during manufacturing?

  1. By varying the amount of animal glue added to the carbon black paste
  2. By altering the density of natural tree resin mixed into the powdered lead
  3. By adjusting the proportional ratio of clay to graphite powder before firing Correct answer.
  4. By adding varying concentrations of synthetic latex to pure charcoal powder

Explanation

Graphite pencil leads are manufactured by mixing pulverized graphite with kaolin clay and firing the core at high temperatures. Higher clay proportions yield harder leads (H grades), while higher graphite content produces softer, darker marks (B grades).

Question 3Graphic-plastic expression: materials, image-making and project evidence

Which traditional dry media drawing tool is composed of compressed pulverized charcoal bound with small amounts of binder like gum or clay?

  1. Silverpoint stylus
  2. Natural vine charcoal
  3. Compressed charcoal (carbón prensado) Correct answer.
  4. Lithographic crayon

Explanation

Compressed charcoal (carbón prensado) is created by mixing powdered charcoal with a small organic binder (such as gum tragacanth or clay) and pressing it into sticks. This produces darker, richer blacks and harder sticks than un-bound vine charcoal.

Question 4Graphic-plastic expression: materials, image-making and project evidence

What paper property refers to the surface texture and grain roughness that holds dry drawing particles?

  1. Grammage (gramaje)
  2. Opacity (opacidad)
  3. Sizing (encolado)
  4. Tooth (diente o grano) Correct answer.

Explanation

Tooth (diente or grano) describes the physical micro-texture of a paper surface. A paper with sufficient tooth physically grips particles of charcoal, pastel, or graphite, enabling multi-layered dry application without slipping.

Question 5Graphic-plastic expression: materials, image-making and project evidence

Which soft dry medium relies on minimal binder (such as gum tragacanth) to hold pigment particles in a delicate chalky stick?

  1. Soft pastel (pastel suave) Correct answer.
  2. Oil pastel (pastel al óleo)
  3. Conté crayon (lápiz Conté)
  4. Wax crayon (cera)

Explanation

Soft pastels consist almost entirely of pure dry pigment powder held together with just enough binder (tragacanth gum or methylcellulose) to form a stick. They produce intense, velvety color that requires delicate handling and optional fixation.

Question 6Graphic-plastic expression: materials, image-making and project evidence

What is the primary role of a liquid fixative spray applied to soft pastel or charcoal drawings?

  1. To convert dry pigment into a permanent glossy acrylic paint film
  2. To bleach yellowed paper fibres back to bright white
  3. To bind loose pigment particles to the paper substrate and prevent smudging Correct answer.
  4. To dissolve paper sizing and increase sheet absorbency

Explanation

Fixative spray contains a low concentration of resin (such as shellac or synthetic polymer) dissolved in a quick-evaporating solvent. Sprayed over powdery media like pastel or charcoal, it coats pigment particles, anchoring them to paper fibers to minimize smudging.

Question 7Graphic-plastic expression: materials, image-making and project evidence

What required surface preparation enables silverpoint (punta de plata) to leave a metallic trace on paper?

  1. Applying a thick coat of linseed oil to saturate paper pores
  2. Soaking paper in concentrated hydrochloric acid
  3. Coating the paper with an abrasive ground containing bone ash or zinc white (gesso/primer) Correct answer.
  4. Polishing paper with paraffin wax until completely waterproof

Explanation

Silverpoint relies on drawing a fine silver wire across a surface coated with a slightly abrasive ground (traditionally bone ash, white pigment, and hide glue). The micro-abrasive tooth abrades tiny particles of silver from the wire, which oxidize to warm grey-brown lines.

Question 8Graphic-plastic expression: materials, image-making and project evidence

Traditional waterproof Indian ink (tinta china) is formulated with carbon black and which binding agent?

  1. Polyvinyl acetate (PVA)
  2. Turpentine and beeswax
  3. Egg yolk emulsion
  4. Shellac dissolved in an alkaline solution (or natural animal glue) Correct answer.

Explanation

Traditional liquid Indian ink combines fine lampblack (carbon black) with shellac rendered water-soluble in ammonia or borax, or natural gelatin/animal glue. Upon drying, the shellac forms a water-resistant film that prevents ink from re-dissolving when washed over.

Question 9Graphic-plastic expression: materials, image-making and project evidence

Which traditional reddish-brown dry earth medium made of iron oxide clay was widely used by Renaissance masters for anatomical studies?

  1. Sanguine (sanguina) Correct answer.
  2. Silverpoint
  3. Graphite 9B
  4. Vine charcoal

Explanation

Sanguine is a natural red chalk colored by hematite (iron oxide). Renowned for its rich reddish-brown tones, soft blendability, and warm skin-like hues, it was extensively used by Renaissance artists like Leonardo da Vinci and Michelangelo.

Question 10Graphic-plastic expression: materials, image-making and project evidence

What type of paper finish produces a smooth, non-grainy surface ideal for detailed pen-and-ink drawings?

  1. Rough finish (grano grueso)
  2. Embossed burlap linen texture
  3. Handmade deckle rag finish
  4. Hot-pressed finish (prensado en caliente o satinado) Correct answer.

Explanation

Hot-pressed (HP) paper is passed through heated metal rollers during manufacturing, resulting in a smooth, hard surface without pronounced grain. This smooth finish prevents fine pen nibs from catching or feathering.

Question 11Graphic-plastic expression: materials, image-making and project evidence

Which water-soluble binder is traditionally used in artists' watercolor paint (acuarela)?

  1. Linseed oil
  2. Casein milk protein
  3. Gum arabic (goma arábiga) Correct answer.
  4. Nitrocellulose lacquers

Explanation

Gum arabic, a natural water-soluble gum harvested from Acacia trees, is the classic binder in watercolor. It binds pigment particles to paper while allowing quick re-wetting and transparent layering.

Question 12Graphic-plastic expression: materials, image-making and project evidence

What distinguishes gouache (tempera al agua) from transparent watercolor?

  1. Gouache uses oil as a vehicle instead of water
  2. Gouache dries only when exposed to ultraviolet lamps
  3. Gouache cannot be re-wetted once dried
  4. Gouache contains added chalk or opaque white pigment (precipitated calcium carbonate), making it opaque Correct answer.

Explanation

Gouache is an opaque aqueous medium. It shares a gum arabic binder with watercolor but includes inert white extenders (like calcium carbonate or barium sulfate) or higher pigment concentrations, creating flat, matte, opaque layers.

Question 13Graphic-plastic expression: materials, image-making and project evidence

In traditional egg tempera painting, which component of the egg serves as the emulsifying binder?

  1. Egg yolk (yema de huevo) Correct answer.
  2. Egg white (clara de huevo o glair)
  3. Crushed eggshell powder
  4. Chalaza cords

Explanation

Egg yolk is a natural emulsion of water, fats, and lecithin protein. When mixed with dry pigments and distilled water, the lecithin acts as a natural emulsifier, curing into a hard, durable, translucent film.

Question 14Graphic-plastic expression: materials, image-making and project evidence

What is the primary binder used in modern acrylic paint (pintura acrílica)?

  1. Gum tragacanth resin
  2. Natural dammar varnish
  3. Cold-pressed walnut oil
  4. Synthetic acrylic polymer resin emulsion (emulsión acrílica) Correct answer.

Explanation

Acrylic paint consists of inorganic or organic pigment suspended in a water-soluble acrylic polymer resin emulsion. As water evaporates, polymer chains coalesce into a flexible, tough, water-insoluble plastic film.

Question 15Graphic-plastic expression: materials, image-making and project evidence

Which traditional vegetable drying oil is most widely used as the binder in oil painting?

  1. Olive oil
  2. Essential lavender oil
  3. Linseed oil (aceite de linaza) Correct answer.
  4. Mineral paraffin oil

Explanation

Linseed oil, extracted from flax seed (Linum usitatissimum), is the principal binder in oil paint due to its high content of linolenic fatty acids, which cure into a strong film through oxidative polymerization.

Question 16Graphic-plastic expression: materials, image-making and project evidence

What does the fundamental oil painting rule 'Fat Over Lean' (Graso sobre Magro) dictate?

  1. Each subsequent painting layer must contain less oil than the layer beneath it
  2. Initial layers must be heavy in oil, while top glazing layers must be mixed with water
  3. Solvents must only be applied over final thick impasto layers
  4. Flexible, higher-oil layers must be applied over lower-oil, faster-drying base layers to prevent cracking Correct answer.

Explanation

The 'Fat Over Lean' rule mandates that upper layers of oil paint contain a higher proportion of oil ('fat') relative to solvent than lower layers ('lean'). Higher oil content increases flexibility and drying time, ensuring upper layers shrink less and dry slower than underlying layers, preventing film cracking.

Question 17Graphic-plastic expression: materials, image-making and project evidence

Which Ancient painting technique binds pigments using molten beeswax (cera de abejas)?

  1. Encaustic (encáustica) Correct answer.
  2. Fresco secco
  3. Gouache
  4. Sanguine

Explanation

Encaustic involves mixing pigments with molten beeswax and resin (like dammar), applied warm and fused to a rigid wood support with hot irons or blowtorches (as seen in Fayum mummy portraits).

Question 18Graphic-plastic expression: materials, image-making and project evidence

What chemical process causes drying oils (like linseed oil) to harden into a solid paint film?

  1. Evaporation of liquid water contents
  2. Acid-base neutralization forming salt crystals
  3. Freezing crystallization at room temperature
  4. Oxidative polymerization (cross-linking with atmospheric oxygen) Correct answer.

Explanation

Oil paints do not dry by water evaporation. Instead, unsaturated fatty acids in drying oils absorb oxygen from the air, initiating cross-linking reactions (oxidative polymerization) that form a solid linoxin polymer matrix.

Question 19Graphic-plastic expression: materials, image-making and project evidence

Which traditional printmaking category includes linocut (linograbado) and woodcut (xilografía)?

  1. Intaglio printing (grabado en hueco)
  2. Planographic printing (litografía)
  3. Relief printing (grabado en relieve) Correct answer.
  4. Stencil printing (serigrafía)

Explanation

Linocut and woodcut are relief printmaking techniques. Non-image areas are carved away with gouges, leaving raised surface areas that receive ink from a roller to transfer onto paper under pressure.

Question 20Graphic-plastic expression: materials, image-making and project evidence

In intaglio printmaking (grabado en hueco), where is the ink held prior to transferring under heavy press pressure?

  1. On the top uncarved flat surface of the block
  2. Inside woven silk mesh threads
  3. On a greasy stone image drawn with crayon
  4. In incised lines, grooves, or etched recesses carved below the plate surface Correct answer.

Explanation

In intaglio techniques (etching, drypoint, engraving), ink is pushed into grooves cut below the plate surface. The top surface is wiped clean (tarlatan wiping), leaving ink only in recessed channels that transfer under high press roller pressure.

Question 21Graphic-plastic expression: materials, image-making and project evidence

Which intaglio technique uses a sharp steel needle drawn directly onto a metal plate, creating velvety rich lines held by metallic ridges (burrs)?

  1. Drypoint (punta seca) Correct answer.
  2. Aquatint (aguatinta)
  3. Lithography (litografía)
  4. Woodcut (xilografía)

Explanation

Drypoint is a direct mechanical intaglio method where a hard steel needle scratches copper or zinc plates. The needle throws up tiny metallic burrs along line edges, which hold extra ink and produce characteristic soft, velvety printed lines.

Question 22Graphic-plastic expression: materials, image-making and project evidence

What chemical liquid acid solution is traditionally used to etch copper or zinc plates in etching (aguafuerte)?

  1. Distilled vinegar (acetic acid)
  2. Nitric acid solution (ácido nítrico) or Ferric chloride (cloruro férrico) Correct answer.
  3. Concentrated sodium hydroxide (lye)
  4. Linseed oil emulsion

Explanation

Etching (aguafuerte) relies on chemical biting. Plates are coated with an acid-resistant ground, scratched open with a needle, and submerged in nitric acid or ferric chloride baths, which eat away exposed metal lines.

Question 23Graphic-plastic expression: materials, image-making and project evidence

Which printmaking process relies on the chemical immiscibility of grease and water on Bavarian limestone plates?

  1. Linocut
  2. Serigraphy
  3. Lithography (litografía) Correct answer.
  4. Mezzotint

Explanation

Lithography is a planographic technique invented by Senefelder based on the mutual repulsion of grease and water. Greasy drawings attract oil-based ink, while damp non-image areas repel ink.

Question 24Graphic-plastic expression: materials, image-making and project evidence

What tool is used to push ink across a mesh stencil screen in screen printing (serigrafía)?

  1. Baren
  2. Leather ink dabber
  3. Etching press roller
  4. Squeegee (racleta o racleta de goma) Correct answer.

Explanation

A squeegee (racleta) featuring a flexible rubber or polyurethane blade is dragged under firm hand pressure across a stencil mesh to force ink through open screen pores onto the substrate below.

Question 25Graphic-plastic expression: materials, image-making and project evidence

What unique characteristic defines a monotype (monotipo) in graphic printmaking?

  1. It produces a single unique printed impression rather than a large repeatable edition Correct answer.
  2. It requires carving steel plates with diamond chisels
  3. It uses photographic chemical emulsions exposed to solar ultraviolet radiation
  4. It is printed exclusively on wooden boards without paper

Explanation

Monotype is a painterly printmaking method where an image is painted directly onto a smooth non-porous plate (glass or metal) and transferred to paper. Because the wet paint transfers almost completely, it produces only one strong unique print (monotype).

Question 26Graphic-plastic expression: materials, image-making and project evidence

What do the primary additive colors of light combine to create when mixed in equal intensities?

  1. Deep brownish black
  2. Pure white light Correct answer.
  3. Neutral medium grey
  4. Cadmium yellow

Explanation

Additive color mixing involves light sources. The primary additive light colors (Red, Green, Blue - RGB) combine additively to produce white light when mixed at full intensity.

Question 27Graphic-plastic expression: materials, image-making and project evidence

Which set of colors represents the three primary colors in subtractive pigment mixing (CMYK system)?

  1. Red, Green, Blue
  2. Orange, Green, Violet
  3. Cyan, Magenta, Yellow Correct answer.
  4. Brown, Ochre, Black

Explanation

Subtractive pigment printing relies on Cyan, Magenta, and Yellow (CMY, plus Black key) as primary colors. Pigments absorb specific light wavelengths, subtracting color from white ambient reflection.

Question 28Graphic-plastic expression: materials, image-making and project evidence

In color theory, what are complementary colors (colores complementarios)?

  1. Colors located immediately adjacent to each other on the chromatic wheel
  2. Colors formed by mixing three primary colors in equal proportion
  3. Different lightness variations of a single pure hue
  4. Colors positioned directly opposite each other on the chromatic circle Correct answer.

Explanation

Complementary colors sit directly across from one another on the color wheel (e.g., Red and Green, Blue and Orange, Yellow and Violet). When placed side-by-side they maximize visual contrast; when mixed together as pigments they neutralize into dark greys.

Question 29Graphic-plastic expression: materials, image-making and project evidence

Which linear perspective element represents the eye level of the observer on the drawing plane?

  1. Horizon line (línea de horizonte) Correct answer.
  2. Vanishing point (punto de fuga)
  3. Orthogonal visual ray
  4. Ground plane baseline

Explanation

The horizon line corresponds directly to the horizontal level of the viewer's eyes. All vanishing points for horizontal parallel lines lie along this line.

Question 30Graphic-plastic expression: materials, image-making and project evidence

What visual compositional rule divides an image into a 3x3 grid using two horizontal and two vertical lines?

  1. Fibonacci logarithmic spiral
  2. Rule of Thirds (regla de los tercios) Correct answer.
  3. Dynamic symmetry armature
  4. Central pyramid scheme

Explanation

The Rule of Thirds divides a composition into nine equal rectangles with two evenly spaced horizontal and vertical lines. Placing key focal subjects along these lines or grid intersections creates dynamic visual balance.

Question 31Graphic-plastic expression: materials, image-making and project evidence

Which paper sizing chemical, historically used in alum-rosin sizing, causes severe paper acid degradation and yellowing over time?

  1. Calcium carbonate buffer
  2. Methylcellulose paste
  3. Aluminum sulfate (alumbre de aluminio) Correct answer.
  4. Deionized liquid water

Explanation

Aluminum sulfate (alum) introduced in 19th-century alum-rosin sizing reacts with moisture to generate sulfuric acid within paper fibers. Acid hydrolysis breaks down cellulose polymer chains, causing paper embrittlement and yellowing.

Question 32Graphic-plastic expression: materials, image-making and project evidence

What term describes the spotty brownish rust-like spots on historic paper caused by mold action and iron metal impurities?

  1. Crazing
  2. Saponification
  3. Blooming
  4. Foxing (moteado o foxing) Correct answer.

Explanation

Foxing refers to reddish-brown spots or blotches on vintage paper. It is caused by fungal oxidation interacting with trace iron particles in paper fibers under humid conditions.

Question 33Graphic-plastic expression: materials, image-making and project evidence

Why must oil-soaked rags (trapos impregnados de aceite de linaza) be stored in sealed water-filled safety containers in an art studio?

  1. They can spontaneously combust due to exothermic oxidation of drying oils Correct answer.
  2. Linseed oil evaporates into toxic explosive chlorine gas
  3. Rags attract wood-boring beetle larvae
  4. Unwashed oil rags turn into sticky acrylic plastic within minutes

Explanation

Linseed oil cures through exothermic oxidative polymerization. In a crumpled rag, heat generated by rapid oxidation cannot dissipate, potentially elevating temperatures to ignition point and causing spontaneous combustion.

Question 34Graphic-plastic expression: materials, image-making and project evidence

Which toxic heavy metal pigment, historically valued for its brilliant opaque white color, is known to cause severe neurological damage (plumbism)?

  1. Titanium white (TiO2)
  2. Flake / Lead white (blanco de plomo - basic lead carbonate) Correct answer.
  3. Zinc white (ZnO)
  4. Barium sulfate (Barita)

Explanation

Flake white (lead white) is basic lead carbonate $2PbCO_3 · Pb(OH)_2$. Lead ingestion or inhalation accumulates in human bones and organs, causing chronic poisoning, neurological damage, and colic.

Question 35Graphic-plastic expression: materials, image-making and project evidence

What is the recommended relative humidity (RH) range for archival museum storage of paper works of art?

  1. 10% – 20% RH
  2. 80% – 95% RH
  3. 45% – 55% RH Correct answer.
  4. 0% RH (completely desiccated)

Explanation

Museum conservation guidelines recommend maintaining paper works of art at 45–55% RH. Below 40% RH, paper turns brittle; above 65% RH, mold growth, foxing, and bio-deterioration accelerate rapidly.

Question 36Graphic-plastic expression: materials, image-making and project evidence

How does silverpoint line work change visually over time as it ages on paper?

  1. It remains bright metallic silver indefinitely without shift
  2. It completely evaporates into white dust within one year
  3. It turns bright fluorescent yellow upon exposure to oxygen
  4. It oxidizes and tarnishes from initial pale silver-grey to warm sepia brown Correct answer.

Explanation

Microscopic silver particles deposited by a silverpoint stylus react with airborne sulfur compounds to form silver sulfide ($Ag_2S$). This tarnishing process shifts initial silver-grey lines into warm, rich sepia-brown tones over time.

Question 37Graphic-plastic expression: materials, image-making and project evidence

What physical property of paper describes its mass per square meter, usually expressed as g/m²?

  1. Grammage (gramaje o peso del papel) Correct answer.
  2. Porosity (porosidad)
  3. Dimensional stability
  4. Calender index

Explanation

Grammage measures paper density/weight in grams per square meter (g/m²). Standard drawing papers range from 90 to 180 g/m², while heavy watercolor papers typically measure 300 g/m² to resist buckling when wet.

Question 38Graphic-plastic expression: materials, image-making and project evidence

Which natural resin, extracted from lac insect secretions, is dissolved in alcohol to make traditional fixatives and varnishes?

  1. Dammar resin
  2. Shellac (goma laca) Correct answer.
  3. Mastic resin
  4. Colophony pine rosin

Explanation

Shellac (goma laca) is a natural resin secreted by female Kerria lacca insects on trees in India and Thailand. Dissolved in denatured alcohol, it forms quick-drying protective coats, drawing fixatives, and wood sealers.

Question 39Graphic-plastic expression: materials, image-making and project evidence

What is the key visual difference between warm earth pigments Raw Sienna and Burnt Sienna?

  1. Raw Sienna is bright green; Burnt Sienna is cobalt blue
  2. Burnt Sienna is calcined by heating, converting hydrated iron oxide into deep reddish-brown anhydrous iron oxide Correct answer.
  3. Raw Sienna contains synthetic acrylic polymers; Burnt Sienna contains egg yolk
  4. Burnt Sienna is insoluble in oil media, while Raw Sienna dissolves completely

Explanation

Raw Sienna contains hydrated iron oxide ($FeO(OH)· nH_2O$), displaying a yellowish-brown hue. Roasting (calcining) drives off bound water, transforming it into anhydrous ferric oxide ($Fe_2O_3$), known as Burnt Sienna, which is rich reddish-brown.

Question 40Graphic-plastic expression: materials, image-making and project evidence

Why is distilled water preferred over tap water when preparing egg tempera or watercolor paint?

  1. Tap water evaporates ten times faster than distilled water
  2. Distilled water contains natural acrylic resins that improve paint adhesion
  3. Distilled water dissolves oil paint binders completely
  4. Tap water contains chlorine, mineral salts, and micro-organisms that can cause mold growth or chemical pigment reactions Correct answer.

Explanation

Tap water contains dissolved minerals (calcium, iron, chlorine) and bacteria that can react with sensitive organic pigments or ruin organic egg yolk emulsions, prompting fungal decay.

Question 41Graphic-plastic expression: materials, image-making and project evidence

In watercolor, what term describes laying down paint on damp paper so pigment flows and creates soft, blended edges?

  1. Wet-on-wet (mojado sobre mojado) Correct answer.
  2. Drybrush (pincel seco)
  3. Scumbling (frotado)
  4. Impasto

Explanation

Wet-on-wet (mojado sobre mojado) involves applying wet paint onto paper pre-moistened with water. Capillary action spreads pigment across water channels, creating atmospheric, feather-edged color washes.

Question 42Graphic-plastic expression: materials, image-making and project evidence

What happens if a painter applies a 'lean', fast-drying turpentine layer over a thick, slow-drying 'fat' oil paint layer?

  1. The top layer flexes perfectly and enhances paint gloss
  2. The fast-drying top layer contracts and cures quickly while the lower soft oil layer beneath continues moving, causing cracking and wrinkling Correct answer.
  3. The oil paint instantly converts into water-soluble watercolor paint
  4. The canvas becomes completely transparent

Explanation

Violating 'Fat Over Lean' causes severe paint structure failure. The lean upper layer dries quickly into a rigid brittle film. As the underlying fat layer absorbs oxygen and expands/contracts over months, the upper rigid shell tears open, forming cracks (craquelure) and wrinkling.

Question 43Graphic-plastic expression: materials, image-making and project evidence

Which volatile solvent, steam-distilled from pine tree oleoresin, is traditionally used to thin oil paints and dissolve natural resins?

  1. Denatured ethanol
  2. Acetone
  3. Spirits of Turpentine (esencia de trementina o aguarrás natural) Correct answer.
  4. Ethylene glycol

Explanation

Gum spirits of turpentine (aguarrás natural) is distilled from pine balsam resin. It is a terpene-based solvent used to thin oil paint underlayers, dissolve dammar or mastic resins, and clean oil brushes.

Question 44Graphic-plastic expression: materials, image-making and project evidence

What advantage does mineral spirit / odorless mineral spirits (OMS) offer over traditional gum turpentine in the studio?

  1. It dries ten times slower than drying oils, allowing painting underwater
  2. It has lower aromatic toxic vapor levels and causes fewer allergic skin reactions than pine turpentine Correct answer.
  3. It dissolves dry acrylic paint back into liquid emulsion
  4. It permanently prevents oil paints from yellowing in darkness

Explanation

Odorless Mineral Spirits (OMS) are refined petroleum distillates stripped of aromatic hydrocarbons. They provide effective oil thinning with significantly lower toxic fumes and reduced skin sensitization compared to pine turpentine.

Question 45Graphic-plastic expression: materials, image-making and project evidence

What function does a final picture varnish (barniz de acabado) serve when applied to a fully dried oil or acrylic painting?

  1. It provides a protective barrier against atmospheric dirt and UV light while unifying surface sheen Correct answer.
  2. It permanently melts paint layers into a smooth glass block
  3. It makes oil paint dry in five seconds
  4. It converts opaque pigments into transparent watercolors

Explanation

Final varnish protects the delicate paint film from air pollutants, dirt, scratches, and UV degradation. It also unifies patchy glossy/matte surface areas and can be removed by conservators when dirty without damaging underlying paint.

Question 46Graphic-plastic expression: materials, image-making and project evidence

In woodcut printmaking, what is the primary difference between woodcut on plank grain (xilografía al hilo) and end-grain wood engraving (xilografía a testa)?

  1. Plank grain uses softwood cut parallel to trunk fibers; end-grain uses dense hardwood cut perpendicular, allowing fine detailed engraving Correct answer.
  2. End-grain is carved using razor blades, while plank grain is melted with nitric acid
  3. Plank grain prints exclusively in yellow ink; end-grain prints only in blue
  4. End-grain requires no press, while plank grain requires 50 tons of hydraulic pressure

Explanation

Woodcut al hilo (plank grain) cuts along longitudinal wood fibers, best suited for bold expressive shapes carved with gouges. Wood engraving a testa (end-grain) uses hard cross-section boxwood blocks, allowing fine lines carved with burins in any direction without splintering.

Question 47Graphic-plastic expression: materials, image-making and project evidence

Which intaglio process uses a fine dusting of resin powder melted onto a metal plate to create subtle tonal washes and gradations?

  1. Drypoint (punta seca)
  2. Aquatint (aguatinta) Correct answer.
  3. Engraving (buril)
  4. Linocut (linograbado)

Explanation

Aquatint creates broad tonal range in intaglio. Rosin or asphaltum powder is fused onto heated copper plates. Acid bites tiny ring networks around melted resin specks, producing micro-pits that hold ink to print rich grey and black tonal areas.

Question 48Graphic-plastic expression: materials, image-making and project evidence

What distinctive structural feature distinguishes a burin (buril) engraving line from an etched line under magnification?

  1. Etched lines have fuzzy feathered edges; burin lines are bright yellow
  2. Burin lines end in square blunted dots; etched lines are circular bubbles
  3. Burin lines display clean, crisp tapered ends with V-shaped cross-sections, while etched lines show rounded irregular acid-bitten edges Correct answer.
  4. Burin lines contain no ink particles at all

Explanation

A burin cuts metal cleanly out of grooves with a sharp V-shaped diamond point, yielding crisp tapered lines with clean edges. Acid etching bites irregularly along ground edges, producing slightly rougher, micro-pitted line channels under magnification.

Question 49Graphic-plastic expression: materials, image-making and project evidence

Which intaglio technique involves completely roughening a copper plate with a curved serrated rocker tool (escopleador o mecedora) before scraping highlights out of dark velvet blacks?

  1. Mezzotint (tinta de grabado o manera negra) Correct answer.
  2. Soft ground etching (barniz blando)
  3. Chine-collé
  4. Screen printing (serigrafía)

Explanation

Mezzotint (manera negra) is a subtractive tonal intaglio process. The entire copper plate is systematically pitted using a rocker tool so it prints solid black. The artist then works from dark to light, burnishing and scraping metal teeth smooth to create soft light tones.

Question 50Graphic-plastic expression: materials, image-making and project evidence

What chemical liquid solution is applied in lithography to fix the greasy drawing crayon image into the limestone matrix?

  1. Pure acetone and white spirit
  2. Gum arabic solution mixed with mild nitric acid (etch solution) Correct answer.
  3. Molten beeswax and paraffin
  4. Concentrated ammonia water

Explanation

The lithographic 'etch' consists of gum arabic dissolved in water with a few drops of nitric acid. It reacts with limestone, forming hydrophilic calcium nitrate in non-drawn areas and hydrophobic oleophil-absorbed salts under greasy crayon marks.