Texas Class A Barber Written ExamChemical ServicesMedium
A client with extremely curly, resistant hair desires a permanent chemical straightening service. The barber notes the client has a history of sensitivity to strong alkaline chemicals. Which type of relaxer would be the most suitable choice in this scenario?
- ALithium hydroxide relaxer
- BSodium hydroxide relaxer
- CAmmonium thioglycolate relaxer
- DGuanidine hydroxide relaxer
Show answer & explanationAnswer & explanation
Correct answer: D. Guanidine hydroxide relaxer
Guanidine hydroxide relaxers (no-lye relaxers) are generally considered less irritating to the scalp than sodium hydroxide (lye) relaxers, making them a suitable choice for clients with sensitive scalps, while still providing effective straightening for resistant hair.
Why the other options are wrong
- A. Lithium hydroxide relaxers are also 'no-lye' relaxers, but guanidine hydroxide is often preferred for its balance of effectiveness and reduced irritation.
- B. Sodium hydroxide relaxers are strong 'lye' relaxers known for effective straightening but can be very irritating to sensitive scalps.
- C. Ammonium thioglycolate relaxers (thio relaxers) are typically milder and often used for permanent waves, but may not provide sufficient straightening for extremely resistant hair compared to hydroxide relaxers.
Guanidine Hydroxide Relaxers
A type of 'no-lye' chemical relaxer that is generally less irritating to the scalp than sodium hydroxide relaxers, suitable for clients with sensitive scalps.
- Active ingredient: Guanidine hydroxide
- Considered 'no-lye' (does not contain sodium hydroxide)
- Less irritating to scalp than lye relaxers
- Effective for straightening resistant hair
Memory trick: Guanidine 'G'ently 'H'elps 'S'ensitive 'S'calps