Background: Finding alternative hair dyes for individuals allergic to para-phenylenediamine (PPD ... allergic to PPD will tolerate PPD-free hair dyes containing PTDS. Methods: A retrospective ...
There are a ton of hair dyes that are free of ammonia, alcohol, and p-phenylenediamine (PPD, a chemical that helps open up your hair cuticle to let the dye in). These ingredients aren't bad or ...
Why now? Granted, p-phenylenediamine (PPD) has been the leading permanent hair coloring agent or oxidative hair dye in most of the Western world since its introduction in the 1880s, [1] and it has ...
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