NIC Cosmetology Written (Theory) ExamHair Care and ServicesMedium
A client with fine, brittle hair and a sensitive scalp requests a permanent wave. Which type of permanent waving solution would be most appropriate to minimize damage and irritation?
- AAlkaline (cold) perm
- BAmmonia-free thio perm
- CTrue acid wave
- DExothermic perm
Show answer & explanationAnswer & explanation
Correct answer: C. True acid wave
True acid waves have a pH of 4.5 to 7.0, making them much gentler on the hair and scalp compared to alkaline perms. They are ideal for fine, fragile, or sensitive hair that could be easily damaged by stronger alkaline solutions.
Why the other options are wrong
- A. Alkaline perms (pH 9.0-9.6) are strong and can be too harsh for fine, brittle hair and sensitive scalps.
- B. Ammonia-free thio perms are still alkaline and can be too strong for very fine, brittle hair and sensitive scalps, though less odoriferous.
- D. Exothermic perms are alkaline perms that create their own heat, which can exacerbate damage on fine, brittle hair and sensitive scalps.
True Acid Waves
Permanent waves with a low pH (4.5-7.0) that process with heat, ideal for delicate or damaged hair.
- Require external heat (hood dryer) to process.
- Produce soft, natural-looking curls.
- Are gentler on the hair and scalp than alkaline perms.
Memory trick: Acid waves are like gentle streams, for hair that's fragile, fulfilling dreams.