What is the difference between ammonium thioglycolate and sodium hydroxide?
Sodium hydroxide is very alkaline and is more commonly used for relaxing the hair. Ammonium thioglycolate is milder and is usually used prior to a soft curl perm. If the hair has low porosity, how is the chemical service affected? Resistant hairhair with low porosityhas a tight, compact cuticle layer that resists penetration. Chemical services performed on resistant hair require a more alkaline solution. A high pH raises the cuticle and permits uniform saturation and processing. Resistant hair also requires a slow and thorough application of perm solution to ensure complete saturation. What is the difference between a base relaxer and a no-base relaxer? Base relaxers require the application of base cream to the entire scalp prior to the application of the relaxer. No-base relaxers do not require application of a protective base. They contain a base cream that is designed to melt at body temperature.
