Why now? Granted, p-phenylenediamine (PPD) has been the leading permanent hair coloring agent or oxidative hair dye in most of the Western world since its introduction in the 1880s, [1] and it has ...

hydrogen peroxide and p-phenylenediamine. Ammonia, an alkaline chemical, raises the pH level of the hair. This then pulls apart layers of hair's proteins, so that the dye can access the hair shaft ...

"Most hair dyes contain p-phenylenediamine ... and gentler ingredients. "It's free of all of the harshest ingredients that are commonly found in hair color products and is leaping bunny-certified ...

Many alternatives to PPD-containing hair dyes are on the market, though color options may be more limited. They are PPD-related chemicals, such as hydroxyethyl-p-phenylenediamine sulfate (HPPS ...

Hair dyes add color to hair strands but may cause hair ... re allergic to any of the compounds or ingredients in henna ink. P-phenylenediamine (PPD) is a chemical compound commonly found in ...

Hydrogen Peroxide, an oxidizing agent in chemical-based dyes, can cause skin and eye irritation and damage the hair structure. P-phenylenediamine ... Hair dye residues, when improperly disposed ...

Top of my list to avoid is p-Phenylenediamine ... to dye your hair? Avoid the darkest colours to avoid high levels of PPD, and look for salons using PPD-, ammonia- and resorcinol-free colours.

[11] In addition to reactions related to hair coloring, PPD and related substances ... such as N-isopropyl-N′-phenyl-p-phenylenediamine agents in the black rubber mix patch-test allergen.