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 ...

An allergic reaction to hair dye will usually start within two to three ... to cause an allergy is called para-phenylenediamine (PPD). PPD is found in more than two-thirds of permanent hair ...

Background: Finding alternative hair dyes for individuals allergic to para-phenylenediamine (PPD) has been difficult. Newer permanent and demipermanent hair dyes that have replaced PPD with para ...

P-phenylenediamine (PPD), One of the most common ingredients in hair dyes, is known for causing severe allergic reactions and potentially increasing the risk of cancer. Resorcinol, another ...