NIC Master Barber Theory cheat sheet
NIC Master Barber Theory · Keep the key ideas within reach.
Sanitation, Disinfection, and Infection Control
Cleaning removes visible debris; disinfection kills most pathogens on surfaces; sterilization destroys all microbial life including spores.
EPA-registered hospital-grade disinfectant with tuberculocidal claim is required for blood or body-fluid contact; follow label contact time exactly.
Implements that pierce or cut skin (razors, shears, blades) are single-use or must be cleaned and sterilized; porous items that cannot be disinfected are discarded.
Blood spill protocol: stop service, put on gloves, clean visible matter with absorbent towel, disinfect with tuberculocidal product, discard contaminated materials in sealed bag.
Hand washing: wet hands, apply soap, scrub palms, backs, between fingers, and under nails for at least 20 seconds, rinse, dry with disposable towel.
Disinfectant containers must be labeled, covered, and changed according to manufacturer directions; test strips verify required concentration.
Universal precautions treat all blood and body fluids as infectious; PPE includes gloves, and goggles when splashing is possible.
State board inspections commonly check: current licenses posted, disinfectant log, covered waste containers, and clean/sanitized implement storage.
Hair and Scalp Care, Shampooing, and Treatments
Hair analysis: porosity (ability to absorb moisture), elasticity (stretch and return), density (number per square inch), texture (diameter).
Normal hair has a pH around 4.5–5.5; alkaline shampoos swell the cuticle, acidic rinses close it and add shine.
Shampoo selection: clarify for buildup, moisturizing for dry/frizzy, medicated (ketoconazole, zinc pyrithione, salicylic acid) for dandruff or seborrheic conditions.
Scalp massage manipulations: effleurage (gliding), petrissage (kneading), tapotement (tapping), vibration; avoid on inflamed or broken skin.
Water temperature for shampooing: warm (not hot) to avoid stripping oils and irritating scalp; cool rinse helps seal cuticle.
Conditioner acts on the cuticle; apply mid-shaft to ends, avoid scalp unless product is designed for it, and rinse thoroughly.
Contraindications for scalp treatments: open lesions, recent chemical burn, active fungal infection; refer to physician when uncertain.
Client consultation for hair care records hair history, medications, and prior chemical services to avoid adverse reactions.
Haircutting, Clipper Work, and Tapering
Reference points: parietal ridge, occipital bone, apex, crown, nape; use them to balance sections and maintain symmetry.
Elevation (projection) determines layer: 0° = blunt/one-length, 45° = graduated, 90° = uniform layer, 180° = long layer.
Cutting lines: horizontal builds weight, vertical removes weight, diagonal creates blended graduation.
Clipper guard numbers correspond to cut length; #1 = 1/8 in (3 mm), #2 = 1/4 in (6 mm), #3 = 3/8 in (10 mm), #4 = 1/2 in (13 mm).
Tapering: start at nape with longest guard, work upward, then blend downward using shorter guards and clipper-over-comb.
Shear-over-comb and clipper-over-comb remove bulk and blend transitions; keep comb teeth parallel to head shape.
Cross-checking: cut against the growth pattern and re-check in opposite direction to detect uneven areas.
Dry cutting reveals true length and shrinkage; always confirm final shape with client before finishing.
Shaving, Beard Design, and Facial Hair Services
Shaving lather: warm water, shave cream or soap, and a clean brush; lather softens hair and protects skin.
Razor angle: about 30 degrees to skin; stretch skin taut and shave in direction of hair growth for comfort.
Beard shapes: full beard, goatee, Van Dyke, chinstrap, mutton chops; design based on face shape and hair growth pattern.
Outline beard with trimmer or razor, define cheek line and neckline (typically one finger above Adam's apple), then blend.
Hot towel before shave opens pores and softens hair; cold towel after closes pores and reduces irritation.
Aftershave: alcohol-based for antiseptic and astringent effect, witch hazel for sensitive skin, moisturizer to restore barrier.
Contraindications for shaving: active acne, cold sores, recent chemical peel, sunburn; postpone service.
Sanitation: single-use blade, clean towel per client, disinfect razor handle and clipper blades between clients.
Hair Coloring and Lightening
Color wheel: primary red, yellow, blue; secondary orange, green, violet; complementary colors neutralize unwanted tones.
Level system 1 (black) to 10 (lightest blonde); identify natural level and desired level before formulating.
Developer volumes: 10 vol (3%) deposit only, 20 vol (6%) 1–2 levels lift, 30 vol (9%) 2–3 levels, 40 vol (12%) 3–4 levels.
Permanent color: alkaline, lifts and deposits, requires patch test 24–48 hours before service.
Semi-permanent color: no lift, deposits only, fades over 6–12 shampoos; demi-permanent uses low-volume developer.
Lightening (bleach) lifts melanin; process visually and do not exceed manufacturer time; strand test recommended.
Toner after lightening deposits color to neutralize brass; use low-volume developer (5–10 vol).
Law: patch test and client record required for aniline derivative products; follow state board and manufacturer directions.
Chemical Texture Services and Relaxing
Relaxer strength: no-lye (calcium hydroxide/guanidine) vs lye (sodium hydroxide); base scalp and follow manufacturer timing.
Relaxer application: protect scalp, apply to new growth first, smooth, rinse thoroughly, then neutralize with shampoo.
Neutralization lowers pH and stops relaxer action; use neutralizing shampoo until lather is white and pH test passes.
Permanent wave: thioglycolate (acid) or glyceryl monothioglycolate (acid) vs alkaline (ammonium thioglycolate) per manufacturer.
Perm wrapping: tension and rod size determine curl; end papers protect ends; process, rinse, blot, neutralize.
Hair analysis before chemical service: porosity, elasticity, prior chemical history; do not service hair that is overly porous or breaking.
Contraindications: recent relaxer (wait per manufacturer), scalp abrasions, pregnancy (consult physician), active infection.
Record keeping: product, strength, processing time, and result for each client to ensure consistency and safety.
Anatomy, Physiology, and Histology of Hair, Skin, and Nails
Hair structure: medulla (core), cortex (bulk, pigment), cuticle (outer protective scales).
Hair growth cycles: anagen (growth, 2–6 years), catagen (transition, weeks), telogen (rest, months).
Skin layers: epidermis (outer), dermis (nerves, glands, follicles), subcutaneous (fat).
Nail structure: nail plate, nail bed, matrix (growth), cuticle, lunula (half-moon).
Bones of skull: frontal, parietal, occipital, temporal; facial bones include mandible, maxilla, zygomatic.
Muscles: frontalis raises eyebrows, temporalis and masseter for chewing, occipitalis pulls scalp back.
Nerves: facial nerve (VII) controls facial expression; trigeminal (V) provides sensation; avoid pressure on nerve points.
Glands: sebaceous (oil) attached to hair follicle; sudoriferous (sweat) eccrine and apocrine.
Chemistry, Product Knowledge, and Implements/Tools
pH scale 0–14; 7 neutral; hair and skin slightly acidic (4.5–5.5); alkaline opens cuticle, acid closes.
Surfactants in shampoo: anionic (cleansing), cationic (conditioning), amphoteric (mild), nonionic (gentle).
Disinfectant types: quaternary ammonium (low-level), phenols, alcohol; follow EPA registration and contact time.
Shears: forged steel, beveled or convex edge; sharpen regularly and oil pivot; never cut paper or drop.
Clippers: blade size #000 to #1.5 for close work; clean and oil blades after each use; replace worn blades.
Combs and brushes: hard rubber or plastic; sanitize after each client; discard cracked or broken implements.
Mixing color: always use nonmetallic bowl, measure developer and color accurately; never return unused product to bottle.
Safety: keep chemicals labeled, store away from heat, and follow SDS (Safety Data Sheet) for each product.
State Barbering Law, Rules, and Regulations
License renewal: most states require continuing education (e.g., 8–16 hours) and renewal every 1–2 years.
Shop license must be posted; booth renters and employees must hold individual licenses.
Sanitation standards: disinfectant log, covered waste, hand-washing sink, and clean towels per client.
Prohibited practices: using methyl methacrylate (MMA) in artificial nails; certain states restrict razor shaving for unlicensed persons.
Client records: retain chemical service records and patch test results per state retention period.
Inspection: state board may inspect without notice; violations can lead to fines, suspension, or revocation.
Scope of practice: barbers may perform haircutting, shaving, beard design, and limited chemical services as defined by state law.
Advertising: must include license number where required; no false or misleading claims.
Professional Image, Ethics, Business, and Shop Management
Professional image: clean uniform, closed-toe shoes, hair tied back, no strong fragrances, good hygiene.
Ethics: confidentiality of client information, informed consent for chemical services, honest pricing, no discrimination.
Business math: retail price = cost × markup; profit = revenue − expenses; break-even = fixed costs ÷ (price − variable cost per service).
Booking: confirm appointments, keep buffer time for chemical services, and record no-shows per policy.
Client retention: consultation, follow-up, loyalty programs, and consistent service quality.
Shop management: inventory control, staff scheduling, safety training, and compliance with state board rules.
Marketing: social media, referrals, and community events; maintain professional photos and accurate service menu.
Insurance: professional liability and general liability coverage recommended for barbers and shop owners.