California Cosmetology Written ExamChemical Texture ServicesMedium
A client selects a relaxer that generates its own heat once the cream base is mixed with an activator, intensifying the straightening action during application. This type of relaxer is classified as:
- AEndothermic
- BNo-base
- CExothermic
- DThioglycolate-based
Show answer & explanationAnswer & explanation
Correct answer: C. Exothermic
An exothermic chemical reaction releases heat; exothermic relaxers are formulated so mixing the cream with an activator produces a heat-generating reaction that speeds and intensifies straightening, distinguishing them from endothermic (heat-absorbing/requiring outside heat) or thio-based products.
Why the other options are wrong
- A. Endothermic relaxers require an outside heat source such as a hooded dryer.
- B. No-base refers to whether protective cream is needed, not a heat classification.
- D. Thioglycolate relaxers are chemically distinct (thio-based, not hydroxide/heat-generating).
Exothermic Relaxer
A hydroxide relaxer that produces heat through its own chemical reaction (cream + activator) to enhance straightening.
- Self-heating reaction increases strength/speed of straightening
- Contrasts with endothermic relaxers, which need external heat
- Requires careful timing to avoid scalp burns/overprocessing
Memory trick: Exo = exits heat on its own, like a mini heater in the jar.