Hair Dye By: Ashley B. Rachel H.

Minerals such as lead acetate, lead sulfide; silver nitrate; salts of bismuth, copper, and cobalt (commonly called "gradual" colorants) are used to dye hair. Chemicals are absorbed into hair to change the color. Semi-permanent and permanent dyes need to have surfactant, Solvent, alkalizing, oxidant, dye.

Hair dye is difficult to remove because it changes the chemical bonds that determine the color. It makes the hair fibers dry and fragile.

Paraphenylenediamine produces brown shades when used with oxidizing agents. If you want other colors of hair you add other chemicals to the mixture, these are called compounds or coupling agents. Coupling agents aren’t colored themselves but they react with other molecules to make a range of different colors.

Depending on the type of hair dye it could be endothermic or exothermic. Some dyes need heat to get started so that would be endothermic. Exothermic dyes usually create their own heat through chemical reactions.

Ammonia is a key ingredient to dyeing it causes the cuticles of hair to swell which allows the molecules to pass into the hair and make the color permanent.

Because of all the chemicals hair dye can cause bladder cancer. Studies on those who dye their own hair at home found no relation between development of bladder cancer and use of the dyes.

Credits:

Created with images by artursfoto - "hair color coloring" • mommyknows { Kim Becker } - "DIY dip dye hair" • luisjromero - "Legal & illegal" • sukkulaati - "untitled image" • thepeachpeddler - "Splat! Pink, Purple, Blue, Teal"

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