California Barber Written ExamHair Care ServicesMedium
A barber is performing a permanent waving service on a client who has previously colored hair. To ensure the integrity of the hair and prevent excessive damage, which type of perm product is generally recommended for color-treated or delicate hair?
- AAcid-balanced perm
- BAlkaline (cold) perm
- CExothermic perm
- DThioglycolate-free perm
Show answer & explanationAnswer & explanation
Correct answer: A. Acid-balanced perm
Acid-balanced perms (pH 4.5-7.0) are gentler than alkaline perms because their lower pH is closer to the natural pH of hair. This makes them ideal for color-treated, delicate, or damaged hair, as they minimize swelling of the cuticle and reduce the risk of over-processing and damage.
Why the other options are wrong
- B. Alkaline perms are strong and can be too harsh for color-treated or delicate hair, potentially causing damage.
- C. Exothermic perms are a type of acid perm that self-heats, but the 'acid-balanced' classification specifically highlights its pH suitability for delicate hair.
- D. Thioglycolate-free perms (often based on sulfites) are generally milder but 'acid-balanced' directly refers to the pH suitability for delicate hair, which is the core concept here.
Acid-Balanced Perms
Acid-balanced perms are permanent wave solutions with a pH between 4.5 and 7.0, making them gentler on the hair. They are ideal for color-treated, fragile, or damaged hair, producing softer curls with less risk of damage.
- Lower pH (4.5-7.0).
- Gentler on hair.
- Produces softer, looser curls.
- Recommended for fragile, color-treated, or damaged hair.
Memory trick: Acid 'aids' delicate hair, alkaline 'attacks' with care.