Barbering
Domain Overview
The NH Barber exam’s Barbering domain assesses whether you can deliver safe, professional services and explain the science behind them. Questions cover infection control, tool mastery, haircutting theory, shaving technique, and basic anatomy/chemistry.
Sanitation and Infection Control
Barbering tools fall into three categories: cleaning (physical removal of debris), disinfection (killing most pathogens on nonporous surfaces), and sterilization (destroying all microorganisms). For shop practice, use EPA-registered hospital-grade disinfectant on clippers, shears, and razors after each client. Immerse blades fully, or spray and wipe according to label contact time. Blood and body-fluid spills require gloves and an EPA-registered tuberculocidal disinfectant.
Haircutting and Shaving Mechanics
Sectioning, elevation, and distribution control shape. Elevation is the angle at which hair is held from the head; 0° creates a solid form, 45° a graduated layer, 90° uniform layers, and 180° long layers. Clipper-over-comb and shear-over-comb blend transitions. For shaving, soften beard with warm towel, apply lather, hold razor at about 30° and stretch skin taut. Shave with the grain first, then across; against-the-grain shaving increases irritation risk. After shaving, apply astringent or moisturizer.
Worked Example
A client wants a low fade with a clean neckline but has a small ingrown hair at the nape. Reasoning: do not shave over the lesion. Use clippers with a 0.5 guard to set the fade, then trim the neckline with trimmer edge, leaving the ingrown area uncut. Disinfect clippers before and after. Explain to the client that shaving over it could worsen inflammation; recommend a dermatologist if it persists.
Traps That Cost Marks
- Confusing disinfection with sterilization; sterilization is not required for routine shears.
- Using too high a razor angle (over 45°), causing razor burn.
- Forgetting to disinfect clipper blades between clients.
- Ignoring scalp conditions like tinea or psoriasis and proceeding with service.
- Mixing disinfectant at wrong dilution; always follow manufacturer label.