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 ...
Hall's Vegetable Sicilian Hair Renewer advertisement. Warshaw Collection of Business Americana, Archives Center, National Museum of American History, Smithsonian Institution The Museum’s collection of ...
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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