Which chemical should never be mixed with perm solution?

The mixing of a perm solution with a neutralizer or other chemical relaxers is inadvisable due to the potential for harmful chemical reactions. Perm solutions typically contain ammonium thioglycolate or similar agents that break down hair's disulfide bonds to create curls or waves. Neutralizers, on the other hand, are formulated to reform these bonds after the perming process, essentially reversing the effects of a perm. When mixed, these substances can create an unpredictable reaction that may damage the hair structure. Additionally, using chemical relaxers in conjunction with perm solutions can lead to excessive hair weakening or breakage, as both processes are designed to alter the hair's integrity but in opposing ways. Therefore, it's critical to keep these products separate to maintain hair health and achieve desired styling results.