Background: Finding alternative hair dyes ... substances in the dye series. All 10 patients who tested positive to PPD and negative to PTDS who subsequently used a PTDS dye free of PPD tolerated ...

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2. Ingredients: We prioritise products that are free from harmful chemicals like ammonia, PPD, and parabens. 3. Coverage: We consider products that provide full coverage for grey hair. 4.

In this study, we examined whether it is likely that individuals allergic to PPD will be able to tolerate hair-dye products containing PTDS. Starting in January 2008, any patient who had a ...