Background: Finding alternative hair dyes for individuals allergic ... PPD and negative to PTDS who subsequently used a PTDS dye free of PPD tolerated these products. Many individuals allergic ...
The vast majority of reactions to hair-dye products are caused by PPD. [4–6] In past years, PPD was used in permanent hair dyes but not in semipermanent dyes. More recently, PPD has been used in ...
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