Should hair dye be applied before or after thioglycolic acid straightening?

For a product line that contains both,
should hair dye be applied after thioglycolic acid containing hair straightening, in order to prevent the peroxide in the straigthener neutralization from bleaching the recently applied dye, right?

Can hair dye and straightening be combined in a single formulation?
Has this ever been attempted?


  • FekherFekher Member, Professional Chemist
    @Gunther from what i learnt acid is applied after hair  dye cause acid solution close hair fiber.
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