Which chemical is commonly used to neutralize the hair after a perm?

The neutralizing solution is specifically formulated to stop the chemical processes initiated during a perm. After the hair has been curled using the perm solution, which typically contains reducing agents that break down the disulfide bonds in the hair, it is crucial to neutralize the hair to restore its structure. The neutralizing solution typically contains hydrogen peroxide or other oxidizing agents that help to re-form the disulfide bonds, thus fixing the new shape of the hair.

Using a neutralizing solution ensures the longevity of the perm and helps prevent damage to the hair. It is essential to apply this solution according to the manufacturer's instructions to achieve the best possible results and maintain the health of the hair.