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p-Phenylenediamine (PPD) is an organic compound with the formula C 6 H 4 (NH 2) 2. This derivative of aniline is a white solid, but samples can darken due to air oxidation. [1] It is mainly used as a component of engineering polymers and composites like kevlar. It is also an ingredient in hair dyes and is occasionally used as a substitute for ...
For those seeking natural hair dye alternatives, opting for one of the best henna hair dyes allows you to safely color treat your strands without comprising on richness or effectiveness. A ...
A woman with dyed pink hair. Hair coloring, or hair dyeing, is the practice of changing the color of the hair on humans' heads.The main reasons for this are cosmetic: to cover gray or white hair, to alter hair to create a specific look, to change a color to suit preference or to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching.
An elderly Bengali man in Dhaka with a beard dyed in henna. Henna is a reddish dye prepared from the dried and powdered leaves of the henna tree. [1] It has been used since at least the ancient Egyptian period as a hair and body dye, notably in the temporary body art of mehndi (or "henna tattoo") resulting from the staining of the skin using dyes from the henna plant.
Grecian Formula is a men's hair coloring product from Combe Incorporated. Until 2018 (see below) the formulation used in the United States contained lead(II) acetate . [ 1 ] Because lead acetate was banned in cosmetics in Canada and the European Union, the formulations sold there did not contain it.
4-Aminodiphenylamine is a diphenylamine with an additional amine substituent.This dimer of aniline has various industrial uses, including as a hair dye ingredient, but also has raised concerns about toxicity by skin contact. [1]