The best at-home hair color brands for professional results and to cover gray, including permanent and semi-permanent dye for ...

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 ...

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 ...

Children's lives could be at risk because some hairdressing salons are not following guidelines on hair dye products, BBC Wales has found. No dye products should be used on under-16s, according to ...

Smithsonian Institution The Museum’s collection of hair care products includes cleansers and shampoos, hair dyes and bleaches, hair straighteners and hair wavers, and hair styling products, as well as ...