Selection should include knowledge of

• hydroxide relaxer
• ammonium thioglycolate relaxer (i.e., thio)
• keratin straightening and smoothing treatment
• Japanese thermal straightening.

Process/Skill Questions:

• What is the difference between a virgin relaxer and a retouch relaxer?
• What are normalizing solutions? Why are they used?
• Why should one not mix sodium hydroxide with ammonium thioglycolate?