Question: what is the difference between acid alkaline and exothermic perms?
Answer: Glyceryl monothioglycolate – the chemical used in an acid perm – breaks fewer disulphide bonds. Acid perms contain activators that need heat to open the cuticle layers of the hair shaft. Acid perm lotion is gentler and has a pH value of approximately 6 to 7. ... Exothermic perm lotions are self-heating.