What does thio neutralization accomplish in the chemical texturizing process?

Thio neutralization plays a crucial role in the chemical texturizing process, specifically with permanent waves. This step is essential for stopping the action of the waving solution (which typically contains ammonium thioglycolate) and allows the hair to maintain its new curl pattern. During neutralization, a neutralizing agent, often hydrogen peroxide, is applied to the hair. This process reforms the disulfide bonds within the hair structure that were altered during the waving process, effectively locking in the new shape.

By halting the chemical process, thio neutralization ensures that the curls set correctly, preventing the hair from reverting back to its original straight form. This is why it is fundamental to the overall success of the perm and the longevity of the curl. Without this critical step, the intended hairstyle could be lost, and the hair may not maintain its newly styled configuration.