IL Barber key terms

A chemical product registered for use on hard, non-porous surfaces and tools that kills or destroys most harmful microorganisms, but not necessarily bacterial spores. In a barbershop it is used on clippers, shears, combs and work surfaces after cleaning.

The complete destruction of all microbial life, including bacterial spores, usually achieved with an autoclave using high-pressure steam. It is the highest level of decontamination and is required for items that may contact broken skin or blood.

The routine practice of cleaning with soap or detergent and water to remove visible dirt, hair, and many germs from surfaces, linens, and hands. Sanitation is the first step before a tool can be properly disinfected.

Disease-causing microorganisms such as hepatitis B, hepatitis C, and HIV that are carried in human blood and body fluids. Barbers must assume every client could carry them and use barriers, gloves, and proper tool handling to prevent exposure.

A safety approach in which every client is treated as potentially infectious, so gloves, clean towels, and disinfected implements are used every time. The rule removes the need to guess who may be carrying a disease.

The Occupational Safety and Health Administration, the U.S. agency that sets and enforces workplace safety rules. Its standards require barbershops to keep safety data sheets, follow bloodborne pathogen rules, and protect employees from hazards.

A standardized document supplied with every professional product that lists its hazards, safe handling, first aid, and storage requirements. Barbers must keep these sheets available and read them before using an unfamiliar chemical.

The study of fitting the work environment and tools to the worker's body to reduce strain. For barbers this means adjusting chair height, standing posture, and tool grip to prevent back, wrist, and shoulder injuries.

The protective film of sebum and perspiration on the skin and scalp that is slightly acidic, around pH 4.5 to 5.5. It helps block bacteria and keeps hair smooth, so products that disrupt it can leave skin dry and irritated.

A scale from 0 to 14 that measures how acidic or alkaline a substance is, with 7 neutral. Hair and skin prefer mildly acidic products; strong alkalis swell and roughen the hair and can irritate the scalp.

The tough, overlapping outer layer of the hair shaft made of flattened, scale-like cells. It shields the inner hair and controls how much moisture enters, but it can lift from chemical damage, rough brushing, or too-hot tools.

The middle and thickest layer of the hair shaft, made of long protein fibers that give hair its strength, elasticity, and curl. Color and permanent wave chemicals must reach this layer to change the hair's shape or shade.

The tube-shaped pocket in the scalp from which a hair grows, containing the root and its blood and nerve supply. A sebaceous gland usually opens into the follicle, and the follicle's shape helps determine whether hair is straight or curly.

A small gland attached to the hair follicle that secretes sebum, the natural oil that lubricates hair and skin. Overactive glands make hair oily, while underactive glands leave hair and scalp dry and brittle.

The active growth stage of the hair cycle, when new cells form in the follicle and the hair lengthens. It lasts from months to years, and most scalp hairs are in this phase at any given time.

The resting stage of the hair cycle, when growth stops and the old hair is held in the follicle before shedding. It lasts roughly three months, and normal daily shedding of about 50 to 100 hairs reflects this stage.

The pigment produced by cells called melanocytes that gives hair and skin their color. High levels create dark shades and low levels create light shades; bleach removes melanin, while relaxers and permanent waves do not change it.

The ability of dry hair to stretch and then return to its original length without breaking, a sign of healthy protein structure inside the cortex. Low elasticity means the hair snaps easily and chemical services should be delayed.

The hair's ability to absorb and hold moisture, which depends on the condition of the cuticle. Low porosity resists moisture, high porosity soaks up and loses it quickly, and both affect how chemicals and color perform.

The number of hair strands per square inch of scalp, described as thin, medium, or thick. Density tells the barber how much hair there is to cut or shape, while the diameter of a single strand is called texture.

A molecule in shampoo that attracts both water and oil, allowing grease and dirt to lift off the hair and rinse away. Its cleansing strength depends on the type and amount used, and harsh formulas can strip natural oils.

An ingredient in conditioners and styling products that draws moisture from the air into the hair and helps hold it there. Common examples are glycerin and honey, which reduce dryness and add softness.

The angle at which hair is held away from the head while cutting, measured from the scalp. Holding hair at a higher angle removes more length and creates layers, while cutting close to the head keeps weight and length.

The first section of hair cut in a shape, which sets the length and serves as the reference for all following cuts. A barber may use a stationary guideline that stays in place or a traveling guideline that moves along the head.

A cut made with zero elevation in which the ends are cut straight across, producing a solid, heavy line of uniform length. It creates a strong perimeter and works best on hair that is long enough to hold a line.

Cutting techniques that remove bulk or create movement and softness within a shape, using tools such as shears, thinning shears, or a razor. Texturizing should be done after the main shape is set so the outline stays intact.

A gradual change in hair length from longer to shorter, usually at the neckline, sideburns, or around the ears. It gives a soft, blended finish and is the opposite of a hard line.

A strong alkaline cream, usually built on sodium hydroxide or ammonium thioglycolate, that straightens curly hair by breaking bonds in the cortex. It requires careful timing, scalp protection, and thorough rinsing to prevent damage.

A product applied after a relaxer or permanent wave to stop the chemical action and rebuild the hair's disulfide bonds in its new shape. Incomplete neutralizing leaves the hair weak and prone to breaking or reverting.

A two-step chemical service that uses a waving lotion, often containing thioglycolic acid, to break bonds and re-form them around rods. It creates lasting curl that shampooing will not remove.

An oxidizing liquid mixed with hair color or lightener that opens the cuticle and starts the color change. Its strength, called volume, controls how much lift or deposit occurs during the service.

A small amount of product applied to the client's skin, usually behind the ear or on the inner arm, and observed for 24 to 48 hours before a color service. It checks for an allergic reaction and must be documented.

A test performed on a small section of the client's hair before a chemical service to predict how the hair will respond. It guides the choice of product strength and timing, protecting against over-processing.

Firm, even stretching of the skin with the free hand while shaving, which raises the hair and flattens the surface. Good tension allows a closer, safer shave and reduces the chance of nicks and razor burn.

A leather or canvas strip used to realign and polish the edge of a straight razor before each shave. Stropping maintains the blade, while honing on a stone actually reshapes and sharpens a dull edge.

A condition in which tightly curled hairs re-enter the skin after shaving, causing bumps, redness, and ingrown hairs, often called razor bumps. Careful shaving technique, softer edges, and less-close cutting methods help prevent it.

The opening conversation in which the barber asks about the client's goals, hair history, lifestyle, and health, then explains the recommended service, its limits, and its cost. It builds trust and prevents misunderstandings before work begins.