California Barber Written ExamHair Care ServicesMedium
A barber is preparing for a permanent waving service on a client with fine, fragile hair that has been previously colored. Which type of perm solution would be the most appropriate choice to minimize damage while still achieving a noticeable curl?
- AThioglycolate-free perm
- BExothermic perm
- CAlkaline (cold) perm
- DAcid-balanced perm
Show answer & explanationAnswer & explanation
Correct answer: D. Acid-balanced perm
Acid-balanced perms (also known as true acid or acid-balanced waves) have a lower pH (4.5-7.0) and are gentler on the hair, making them ideal for fine, fragile, or color-treated hair. They minimize damage compared to alkaline perms, which have a much higher pH.
Why the other options are wrong
- A. Thioglycolate-free perms (often based on sulfites) are sometimes used for sensitive clients, but 'acid-balanced' directly refers to the pH that makes it gentle for damaged hair.
- B. Exothermic perms are a type of perm that creates its own heat, but their chemical composition can be alkaline or acid, so it's not the primary factor for gentleness.
- C. Alkaline perms have a high pH (9.0-9.6) and are too strong for fine, fragile, or color-treated hair, leading to potential damage.
Acid-Balanced Perms
Acid-balanced permanent waves have a lower pH (4.5-7.0) than alkaline perms, making them gentler and suitable for fragile, fine, or previously colored hair to minimize damage.
- pH range of 4.5 to 7.0.
- Requires heat to process (usually from a dryer).
- Gentler on hair, less swelling.
- Ideal for fragile, fine, or color-treated hair.
Memory trick: Acid for delicate, alkaline for tough.