Texas Cosmetology Operator Written ExamHair Care ServicesMedium
A client with fine, delicate hair desires a permanent wave that will create soft, natural-looking curls with minimal damage. Which type of perm would be most suitable?
- AAlkaline perm (cold wave)
- BExothermic perm
- CThioglycolate-free perm
- DTrue acid perm
Show answer & explanationAnswer & explanation
Correct answer: D. True acid perm
True acid perms are ideal for fine, delicate, or fragile hair because they have a lower pH (4.5-7.0) and process more gently, resulting in softer, more natural-looking curls with less potential for damage compared to alkaline perms.
Why the other options are wrong
- A. Alkaline perms are strong and best for resistant hair, too harsh for delicate hair.
- B. Exothermic perms generate their own heat and can be strong, not ideal for delicate hair.
- C. Thioglycolate-free perms (often called 'thio-free' or 'cysteinamine' perms) vary in strength and are not inherently the gentlest option.
True Acid Perms
Permanent waves with a low pH (4.5-7.0) that process more slowly and gently than alkaline perms, making them suitable for delicate, fine, and color-treated hair to create soft, natural curls.
- Require heat to process (hood dryer).
- Produce softer, looser curls.
- Minimal damage due to lower pH.
Memory trick: Acid perms are for gentle curls, not aggressive ones.