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 ...

Of the 28 patients allergic to PPD who were seen from October 2006 through October 2010, 16 (57.1%) tested negative to all of the other substances on the hair dye series. Eleven of the 28 patients ...

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.