NIC Cosmetology Written (Theory) ExamHair Care and ServicesMedium
A client requests a permanent wave. During the consultation, the cosmetologist notes that the client's hair has been previously highlighted and is somewhat porous. Which type of permanent wave solution would be most appropriate for this client?
- AThio-free waves
- BAcid-balanced waves
- CAlkaline (cold) waves
- DExothermic waves
Show answer & explanationAnswer & explanation
Correct answer: B. Acid-balanced waves
Acid-balanced waves, with a pH of 7.8 to 8.2, are gentler and less damaging than alkaline waves, making them ideal for porous, previously highlighted, or damaged hair.
Why the other options are wrong
- A. Thio-free waves use an ingredient other than ATG, but their pH can still vary. Acid-balanced is the key characteristic for porous hair.
- C. Alkaline (cold) waves are highly alkaline (pH 9.0-9.6) and are too strong for porous or highlighted hair, which can cause damage.
- D. Exothermic waves are a type of permanent wave that creates its own heat, but they can be either alkaline or acid-balanced. The question asks for the most appropriate solution type based on hair condition, not heat generation.
Permanent Wave Solution Types
Different formulations of waving solutions, categorized by their pH and chemical activators, designed for varying hair types and conditions.
- Alkaline (cold) waves: strong, for resistant hair.
- Acid-balanced waves: gentle, for porous/damaged hair.
- True acid waves: very gentle, slow processing.
- Exothermic waves: self-heating, can be alkaline or acid.
Memory trick: Alkaline for Tough, Acid for Tender.