NIC Barber Written (Theory) ExamHair Care ServicesEasy
A barber is preparing to perform a permanent waving service on a client who has previously colored hair. Which type of permanent wave solution would be most suitable to minimize damage and achieve a natural-looking curl?
- AExothermic waves
- BAmmonia-free waves
- CAcid-balanced waves
- DAlkaline (cold) waves
Show answer & explanationAnswer & explanation
Correct answer: C. Acid-balanced waves
Acid-balanced permanent waves are ideal for clients with sensitive, porous, or previously colored hair due to their lower pH, which is closer to the hair's natural pH, minimizing swelling and damage.
Why the other options are wrong
- A. Exothermic waves generate their own heat and can be too strong for previously colored hair, potentially leading to over-processing.
- B. Ammonia-free waves refer to the absence of ammonia, not necessarily the pH level, and may still have a high pH if they are alkaline-based.
- D. Alkaline waves have a higher pH and are typically used for resistant hair, which could cause damage to previously colored hair.
Acid-Balanced Permanent Waves
Permanent wave solutions with a pH between 4.5 and 6.5, making them gentler on hair, particularly for clients with sensitive, porous, or previously colored hair.
- Lower pH than alkaline waves
- Ideal for chemically treated or damaged hair
- Require heat from an outside source (endothermic)
Memory trick: Gentle waves for delicate hair, that's the acid rule.