California Barber Written ExamHair Care ServicesHard
A barber is preparing to perform a permanent waving service on a client with highly porous, damaged hair. Which type of permanent waving solution would be most appropriate to minimize further damage?
- AEndothermic perm
- BExothermic perm
- CAcid-balanced perm
- DAlkaline (cold) perm
Show answer & explanationAnswer & explanation
Correct answer: C. Acid-balanced perm
Acid-balanced perms (true acid perms or acid-balanced waves) have a pH closer to that of hair (4.5-7.0) and are gentler, making them ideal for highly porous, damaged, or color-treated hair to prevent further damage.
Why the other options are wrong
- A. Endothermic perms require an outside heat source and can be gentler than alkaline, but acid-balanced is typically the gentlest.
- B. Exothermic perms generate their own heat and can be strong; not ideal for damaged hair.
- D. Alkaline (cold) perms are strong, with a high pH, and are best for strong, resistant hair, not damaged hair.
Acid-Balanced Perms
Permanent waving solutions with a pH between 4.5 and 7.0, designed to be gentler on the hair, especially porous, damaged, or color-treated hair.
- Minimize swelling and damage.
- Often require external heat for processing (endothermic).
- Produce softer, looser curls.
Memory trick: Acid Avoids Additional Damage.