Question

Soft curl permanents use ______________________________ and oxidation neutralizers just as thio permanent waves do.

Answer 1

Soft curl permanents use ammonium thioglycolate to break disulfide bonds in hair, which are then reformed into a new shape with an oxidation neutralizer such as hydrogen peroxide.

Step-by-step explanation:

Soft curl permanents use ammonium thioglycolate, a basic reducing substance, to reduce and rupture some of the disulfide cross-links in the hair. The process involves putting hair on rollers or curlers to reshape it, and, similar to thio permanent waves, an oxidation neutralizer is used to reform the disulfide bonds in their new positions. This usually involves a dilute solution of hydrogen peroxide which stabilizes the hair's new shape by re-establishing the disulfide bonds.

Answer 2

Soft curl permanents use an oxidizing agent as the neutralizer, similar to thio permanent waves. The formation and disruption of disulfide bonds in hair strands allows for the formation of curls in both temporary and permanent waves.

Step-by-step explanation:

Soft curl permanents use an oxidizing agent, usually a dilute solution of hydrogen peroxide, as the neutralizer. This is similar to how thio permanent waves use oxidation neutralizers. The oxidizing agent in soft curl permanents helps reform the disulfide bonds in their new positions, just like in thio permanent waves. The formation and disruption of these disulfide bonds in hair strands is what allows for the formation of curls in both temporary and permanent waves.