California Barber Written ExamHair Care ServicesMedium
A client with fine, limp hair desires a perm that will provide maximum body and curl, but she is concerned about potential damage due to previous coloring. Which type of perm solution would be most suitable?
- AThioglycolate-free perm
- BAlkaline (cold) perm
- CExothermic perm
- DAcid-balanced perm
Show answer & explanationAnswer & explanation
Correct answer: D. Acid-balanced perm
Acid-balanced perms have a pH between 4.5 and 7.0, making them gentler on the hair, especially for clients with fine, porous, or previously colored hair, minimizing damage while still providing curl.
Why the other options are wrong
- A. Thioglycolate-free perms (often containing cysteamine) are an alternative, but 'acid-balanced' specifically refers to the pH level suitable for damaged hair, regardless of the reducing agent.
- B. Alkaline perms have a high pH (9.0-9.6) and are too strong for fine, previously colored hair, increasing the risk of damage.
- C. Exothermic perms generate their own heat and can be too strong for fragile hair, potentially leading to over-processing.
Acid-Balanced Perms
Permanent waving solutions with a pH between 4.5 and 7.0, designed to be gentler on the hair, especially for porous, fine, or color-treated hair.
- Lower pH (4.5-7.0)
- Less swelling of the hair cuticle
- Minimizes damage to fragile hair
Memory trick: Alkaline is strong, Acid is gentle, Exothermic is hot, Thio-free is an alternative.