OK Barber cheat sheet

Disinfection destroys most pathogenic organisms on nonporous implements but does not kill bacterial spores; sterilization destroys all microbial life including spores.

EPA-registered hospital-grade disinfectant with proven efficacy against HIV-1, hepatitis B, and hepatitis C is the benchmark for tools that contact skin or blood.

Implements must be cleaned of hair, debris, and product residue before immersion in disinfectant, because organic soil inactivates many disinfectants.

Porous items that cannot be disinfected (paper files, cotton, wooden sticks, emery boards) are single-use and must be discarded after one client.

Electrical tools and cords are wiped with an EPA-registered disinfectant spray or wipe; they are never immersed in liquid.

Blood and body-fluid spills are removed with gloves, then the surface is disinfected; contaminated waste goes in a closed receptacle, and hands are washed after glove removal.

Contact time is the label-stated minutes an implement must stay fully submerged; shortening it invalidates the disinfection step.

State barbering law typically requires wet disinfection of clippers, shears, and combs, plus a covered container for soiled implements at the station.

Hand washing with soap and running water for at least 20 seconds is required before and after each client; hand sanitizer is not a substitute when hands are visibly soiled.

The hair follicle is a tube-like depression of the epidermis; the hair bulb at its base encloses the dermal papilla, which supplies blood and nutrients.

The hair shaft has three layers: medulla (innermost, may be absent in fine hair), cortex (bulk, holds pigment and moisture), and cuticle (outer overlapping scales).

The sebaceous gland attaches to the upper follicle and secretes sebum; the arrector pili muscle contracts to raise the hair in cold or emotion.

Growth cycles: anagen (active growth, roughly 2-6 years on the scalp), catagen (transition, about 2-3 weeks), telogen (rest, about 3 months), then shedding.

Scalp hair grows approximately 0.3-0.4 mm per day, about half an inch per month; growth rate does not change with cutting or shaving.

Hair is composed mainly of keratin protein; hydrogen, salt, disulfide, and peptide bonds plus side bonds determine shape and strength.

The three scalp types are normal, oily (sebum spreads along the hair), and dry (insufficient sebum, often flaky or rough).

Melanin in the cortex determines color; eumelanin gives brown-black tones and pheomelanin gives red-blond tones, and gray hair results from loss of melanocyte activity.

Elevation (lifting) is the angle at which hair is held from the head: 0 degrees for a blunt line, 45 degrees for graduation, 90 degrees for uniform layers, 180 degrees for long layers.

A blunt cut is cut at 0 degrees with no elevation and creates a solid, heavy perimeter line.

Graduation stacks weight at the perimeter; layers remove weight and create movement; the guideline is the first section cut and controls all later sections.

Clipper guards work in 1/8-inch increments: a #1 guard leaves 1/8 inch, #2 leaves 1/4 inch, #3 leaves 3/8 inch, #4 leaves 1/2 inch; the #00000 blade cuts closest.

Clipper-over-comb uses the comb as a guide and is used to blend the sides and nape into the top; the clipper blade is held flat against the comb, not angled.

Tapering shortens the hair gradually from a longer length to a shorter one; a fade is a taper taken down to the skin at the perimeter.

Cross-checking means cutting the same section in the opposite direction to verify evenness; it is done after the main cutting pass.

Texturizing techniques (point cutting, notching, slithering) remove bulk and soften a line; they are done on dry hair last to avoid over-thinning.

Shaving direction matters: a with-the-grain pass removes most lather and hair with least irritation; across-the-grain adds closeness; against-the-grain gives the closest shave but the highest risk of razor burn and ingrown hairs.

The correct shaving angle for a straight razor is about 30 degrees from the skin; a steeper angle scrapes skin, a flatter angle skips hair.

Hot towels soften the beard and open the follicle before lather; a cool towel after the shave closes pores and reduces redness.

Lather should be applied in a circular motion to lift the hair, and it should be thick enough to stay in place on the skin.

A straight razor is stropped on leather to align the edge, honed on stone to restore it, and must be disinfected after use; a fresh blade is used for each client where required.

Beard design begins by establishing the natural cheek line and neckline; the neckline is set about one to two finger-widths above the Adam's apple, following the jaw curve.

Facial hair grows in patterns; the moustache, chin, and cheek areas are outlined with the client's bone structure in mind, and symmetry is checked by viewing the face straight on.

A shaving brush lifts hair and distributes lather; it is cleaned and disinfected between clients or is single-use where required by state rule.

The law of color: primary colors are red, yellow, and blue; secondary colors are orange (red + yellow), green (yellow + blue), and violet (red + blue); complementary colors neutralize each other.

Level numbers run 1 (black) to 10 (lightest blond); a color's level plus its tone (ash, gold, red, copper, neutral) describes the shade.

Permanent color uses aniline derivative dyes with hydrogen peroxide developer; the developer opens the cuticle and oxidizes the dye to deposit larger color molecules inside the cortex.

Developer volumes and lift: 10 volume deposits only or darkens, 20 volume lifts about one to two levels, 30 volume lifts about two to three, 40 volume lifts about three to four and is the most damaging.

Lightening (bleach) removes pigment and cannot deposit color; it works best with a higher-volume developer and heat, and the hair must be watched because it can reach the desired level before the recommended time.

A patch test for allergic reaction and a strand test for timing and result are done before a full application; a strand test predicts how the hair will process.

Tone-on-tone and semipermanent colors deposit without lifting and fade over repeated shampoos; demi-permanent uses a low-volume developer and lasts longer than semipermanent.

Hair that has been lightened is more porous and absorbs color unevenly; fillers and porosity equalizers are used before depositing dark color over lightened hair.

Permanent waving breaks disulfide bonds with a reducing agent (ammonium thioglycolate or glyceryl monothioglycolate), reshapes the hair around a rod, then rebuilds bonds with a neutralizer (hydrogen peroxide or sodium bromate).

Rod size controls curl size: a smaller rod gives a tighter curl and a larger rod gives a looser wave; the rod's diameter relative to the hair's natural curve sets the result.

Processing time depends on hair porosity, texture, and the strength of the solution; a test curl shows whether the wave has formed before neutralizing.

A relaxer uses a strong alkaline agent (sodium hydroxide, lithium hydroxide, or guanidine) or ammonium thioglycolate (thio relaxer) to break disulfide bonds and straighten the hair.

Base and no-base relaxers differ in whether a protective cream is applied to the scalp; a base protects the scalp from the relaxer, and the relaxer is applied to new growth only.

A relaxer retouch is applied to new growth, not to previously relaxed hair; overlapping causes overprocessing and breakage.

Neutralizing shampoo for a relaxer lowers the pH and stops the chemical action; the hair is then conditioned and tested for residual relaxer.

Hydrogen peroxide neutralizer also lightens the hair slightly; sodium bromate neutralizer does not lighten and is used when color must be preserved.

Shampoo surfactants lift oil and debris; the product is diluted with water and worked through the hair from scalp to ends, not scrubbed in circles on the scalp.

Water temperature for shampooing is warm, not hot; hot water strips color and oils and irritates the scalp, and cool water tightens the cuticle.

Scalp massage during shampooing increases blood flow; it is done with the pads of the fingers, not the nails, and is contraindicated over inflamed or broken skin.

Conditioner is applied to mid-shaft and ends, not the scalp, because the scalp produces its own oil and heavy conditioner can weigh hair down.

Protein conditioners fill gaps in the cuticle; moisturizing conditioners add water and oil; the correct choice depends on whether the hair is porous or dry.

Scalp conditions that must be referred out include ringworm (tinea), impetigo, and severe seborrheic dermatitis; barbers do not diagnose or treat these.

Shampoo is chosen by hair type and scalp condition: clarifying shampoos remove buildup, and medicated shampoos are used only as directed.

A scalp treatment is a service that cleanses, stimulates, and conditions the scalp; it is not a medical treatment and does not cure disease.

State barbering law sets licensing, sanitation, and scope of practice; a barber must know the rules for the state where they work, and the rules can differ from neighboring states.

Scope of practice limits what a licensed barber may perform; services outside the license (for example, certain chemical or medical procedures) must be declined or referred.

Client records and confidential information are protected; a barber does not disclose a client's personal or health information without consent.

Informed consent and a consultation before chemical services document the client's history, prior products, and expectations, and reduce liability.

A barber must not work while ill with a communicable condition, and must follow the state's rules on gloves, hand washing, and handling of blood.

Advertising must be truthful; claiming official affiliation with a licensing board or using another's credentials is a violation of professional ethics.

Impaired practice (alcohol, drugs, or fatigue) is a violation; a barber must be able to perform safely and must refuse service when a client's condition makes a service unsafe.

The state board inspects shops and can suspend or revoke a license for sanitation or scope violations; keeping a current license displayed is usually required.

Disinfection kills most pathogens on nonporous items but not spores; sterilization kills all microbial life including spores.

Use an EPA-registered hospital-grade disinfectant labeled effective against HIV-1, hepatitis B, and hepatitis C for tools that contact skin.

Clean hair and product residue from implements before disinfection; organic soil reduces disinfectant effectiveness.

Porous items that cannot be disinfected are single-use and discarded after one client.

Electrical tools are wiped with disinfectant spray or wipes and never immersed in liquid.

Blood spills are handled with gloves, then the surface is disinfected; hands are washed after glove removal.

Observe the label contact time for full submersion; shortening it invalidates disinfection.

Wash hands with soap and running water for at least 20 seconds before and after each client.

The follicle is a tube-like epidermal depression; the hair bulb at its base encloses the dermal papilla, which supplies nutrients.

The shaft has three layers: medulla (may be absent in fine hair), cortex (pigment and moisture), and cuticle (outer scales).

The sebaceous gland attaches to the upper follicle and secretes sebum; the arrector pili muscle raises the hair.

Growth cycles: anagen (active, roughly 2-6 years on the scalp), catagen (about 2-3 weeks), telogen (about 3 months), then shedding.

Scalp hair grows about 0.3-0.4 mm per day, about half an inch per month; cutting does not change growth rate.

Hair is mainly keratin; hydrogen, salt, disulfide, and peptide bonds determine shape and strength.

Scalp types are normal, oily, and dry; oily scalp spreads sebum along the hair, dry scalp is often flaky or rough.

Melanin in the cortex sets color: eumelanin gives brown-black, pheomelanin gives red-blond, and gray reflects lost melanocyte activity.

Elevation angles: 0 degrees for a blunt line, 45 for graduation, 90 for uniform layers, 180 for long layers.

A blunt cut is made at 0 degrees with no elevation and creates a solid perimeter line.

Graduation stacks weight at the perimeter; layers remove weight; the guideline is the first section cut and controls the rest.

Clipper guards work in 1/8-inch steps: #1 leaves 1/8 inch, #2 leaves 1/4 inch, #3 leaves 3/8 inch, #4 leaves 1/2 inch; #00000 cuts closest.

Clipper-over-comb uses the comb as a guide to blend sides and nape; the blade is held flat against the comb.

Tapering shortens hair gradually from longer to shorter; a fade is a taper taken to the skin at the perimeter.

Cross-checking cuts the same section in the opposite direction to verify evenness after the main pass.

Texturizing (point cutting, notching, slithering) removes bulk and is done on dry hair last to avoid over-thinning.

With-the-grain shaving removes most lather and hair with least irritation; across-the-grain adds closeness; against-the-grain is closest but risks razor burn and ingrown hairs.

A straight razor is held at about 30 degrees from the skin; steeper scrapes skin and flatter skips hair.

Hot towels soften the beard before lather; a cool towel after the shave closes pores and reduces redness.

Lather is applied in circles to lift hair and must be thick enough to stay in place.

A straight razor is stropped on leather to align the edge and honed on stone to restore it; it is disinfected after use.

Beard design sets the cheek line and neckline; the neckline sits about one to two finger-widths above the Adam's apple, following the jaw curve.

Symmetry is checked by viewing the face straight on; outlines follow the client's bone structure.

A shaving brush lifts hair and spreads lather; it is cleaned and disinfected between clients or is single-use where required.

Primary colors are red, yellow, and blue; secondary colors are orange, green, and violet; complementary colors neutralize each other.

Levels run 1 (black) to 10 (lightest blond); level plus tone (ash, gold, red, copper, neutral) describes a shade.

Permanent color uses aniline derivative dyes with hydrogen peroxide; the developer opens the cuticle and oxidizes dye inside the cortex.

Developer volumes: 10 deposits or darkens, 20 lifts about one to two levels, 30 lifts about two to three, 40 lifts about three to four with the most damage.

Lightening removes pigment and cannot deposit color; hair must be watched because it can reach the target level before the stated time.

A patch test checks for allergic reaction and a strand test predicts timing and result before a full application.

Semipermanent and tone-on-tone colors deposit without lifting and fade with shampooing; demi-permanent uses low-volume developer and lasts longer.

Lightened hair is more porous and absorbs color unevenly; fillers are used before depositing dark color over lightened hair.

Permanent waving breaks disulfide bonds with a reducing agent (ammonium thioglycolate or glyceryl monothioglycolate), reshapes hair around a rod, then rebuilds bonds with a neutralizer.

Rod size controls curl size: a smaller rod gives a tighter curl and a larger rod gives a looser wave.

Processing time depends on porosity, texture, and solution strength; a test curl shows whether the wave has formed.

Relaxers use sodium hydroxide, lithium hydroxide, guanidine, or ammonium thioglycolate to break disulfide bonds and straighten hair.

A base protects the scalp from relaxer; a no-base formula is applied without it, and relaxer is applied to new growth only.

A retouch is applied to new growth, not previously relaxed hair; overlapping causes overprocessing and breakage.

Neutralizing shampoo lowers pH and stops relaxer action; hair is then conditioned and checked for residual relaxer.

Hydrogen peroxide neutralizer lightens hair slightly; sodium bromate does not and is used when color must be preserved.

Shampoo surfactants lift oil and debris; product is diluted with water and worked from scalp to ends.

Water temperature is warm, not hot; hot water strips color and oils, and cool water tightens the cuticle.

Scalp massage uses the pads of the fingers, not the nails, and is avoided over inflamed or broken skin.

Conditioner goes on mid-shaft and ends, not the scalp, because heavy conditioner can weigh hair down.

Protein conditioners fill cuticle gaps; moisturizing conditioners add water and oil; choose by porosity and dryness.

Ringworm, impetigo, and severe seborrheic dermatitis are referred out; barbers do not diagnose or treat them.

Clarifying shampoos remove buildup; medicated shampoos are used only as directed.

A scalp treatment cleanses, stimulates, and conditions the scalp; it is not a medical treatment and does not cure disease.

State law sets licensing, sanitation, and scope of practice; rules differ between states and the barber must know the state where they work.

Scope of practice limits services; anything outside the license must be declined or referred.

Client records and health information are confidential and are not disclosed without consent.

Consultation and informed consent before chemical services document history, prior products, and expectations and reduce liability.

A barber must not work while ill with a communicable condition and must follow state rules on gloves, hand washing, and blood.

Advertising must be truthful; claiming affiliation with a licensing board or using another's credentials violates ethics.

Impaired practice from alcohol, drugs, or fatigue is a violation; service is refused when a client's condition makes it unsafe.

The state board inspects shops and can suspend or revoke a license for sanitation or scope violations; a current license is usually displayed.