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 ...

Indigo powder is a natural hair dye with a long history of use, but it can cause allergic reactions in sensitive individuals. Those with dry, flaky scalps should avoid it, as it may worsen their ...

While ancient dyes were made of plant and animal extracts, the evolution of the practice has seen the use of aggressive chemicals that can trigger allergic reactions and cause harm to users. Hair ...

Using mehendi frequently for hair coloring can lead to excessive dryness, hair thinning, allergic reactions, and difficulty switching to synthetic dye ...

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 ...