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  2. Farouk Shami - Wikipedia

    en.wikipedia.org/wiki/Farouk_Shami

    He invented the first ammonia- free hair color, after developing an allergy to the chemical that initially led doctors to encourage him to leave his profession. [ 2 ] His company, the Houston-based Farouk Systems, currently employs 600+ people in the US, and exports its line of hair and skin care products under the BioSilk, SunGlitz and ...

  3. The Best Hair Dyes to Use at Home, According to Top ... - AOL

    www.aol.com/lifestyle/best-hair-dyes-home...

    Touch Of Gray Hair. Pick up this dye if you want some subtle gray coverage but not to get rid of it completely. “Touch of Gray is ammonia-free and has no peroxide, so it's specifically meant to ...

  4. Hair coloring - Wikipedia

    en.wikipedia.org/wiki/Hair_coloring

    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.

  5. Leather production processes - Wikipedia

    en.wikipedia.org/wiki/Leather_production_processes

    They include salt-free preservation systems, enzyme-assisted low-sulfide hair removal processes, [13] chemical-free enzymatic fiber opening, [14] ammonia-free deliming systems, pickle-free chrome tanning process, waterless chrome tanning technology, [15] chrome-free tanning methods, formaldehyde-free syntans [16] and solvent-free finishing ...

  6. The 6 Best Natural Hair Dyes for Healthier Strands - AOL

    www.aol.com/lifestyle/6-best-natural-hair-dyes...

    Boasting healthier and gentler formulas, these clean hair dyes achieve their rich color payoff and gray-concealing abilities from naturally derived botanicals and pigments instead of known ...

  7. Ammonium thioglycolate - Wikipedia

    en.wikipedia.org/wiki/Ammonium_thioglycolate

    The thioglycolic acid in the perm solution reduces the disulfide cystine bonds in the cortex of the hair. [2] In a sense, the thioglycolate removes crosslinks. After washing, the hair is treated with a mild solution of hydrogen peroxide, which oxidizes the cysteines back to cystine. These new chemical bonds impart the structural rigidity ...

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