Which perm type is self heating and self timing?

Which perm type is self heating and self timing?

• A. Acid perms
• B. Alkaline perms
• C. Exothermic perms
• D. Low/no Thio perms

Answer: (C)

Exothermic perms are designed to heat themselves during processing. The waving lotion’s chemical reaction releases heat, raising the temperature of the solution and the hair. That heat accelerates the break and reform of disulfide bonds, helping the processing happen more quickly. Because the heat provides a natural cue, you often follow the timing by how warm the hair and solution get, rather than relying on an external timer. Other perm types don’t generate that self-heating effect: acid perms and alkaline perms rely on standard processing times and external cues, and low/no thio perms are milder and don’t produce significant self-heating.

Exothermic perms are designed to heat themselves during processing. The waving lotion’s chemical reaction releases heat, raising the temperature of the solution and the hair. That heat accelerates the break and reform of disulfide bonds, helping the processing happen more quickly. Because the heat provides a natural cue, you often follow the timing by how warm the hair and solution get, rather than relying on an external timer. Other perm types don’t generate that self-heating effect: acid perms and alkaline perms rely on standard processing times and external cues, and low/no thio perms are milder and don’t produce significant self-heating.