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2. 3 Reasons Why Temporary Hair Dye Might Be the Right ... - AOL

   www.aol.com/lifestyle/3-reasons-why-temporary...

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3. Should I Wash My Hair Before Dyeing It? The Do's and Don'ts ...

   www.aol.com/wash-hair-dyeing-dos-donts-140040573...

   Greasy hair always appears much darker than it actually is, and if there is loads of dry shampoo or build-up in the hair, it can it harder to comb through when highlighting,” she explains.

4. Should You Try Natural Hair Dye? Colorists Explain How To Use ...

   www.aol.com/15-expert-approved-hair-dyes...

   While they may all deposit color, not all hair dyes deliver long-lasting results. In general, there are four types of hair dye: temporary, semi-permanent, demi-permanent, and permanent.

5. 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.

6. Pyrogallol - Wikipedia

   en.wikipedia.org/wiki/Pyrogallol

   Pyrogallol use, e.g. in hair dye formulations, is declining because of concerns about its toxicity. [10] Its LD 50 (oral, rat) is 300 mg/kg. [3] Pure pyrogallol was found to be extremely genotoxic when inserted into cultured cells, but α amylase proteins protect against its toxicity during everyday exposure. [11] [12]

7. Hair highlighting - Wikipedia

   en.wikipedia.org/wiki/Hair_highlighting

   Hair colorants primarily come in to different forms: oxidative (permanent) and non-oxidative (semi-permanent and temporary).Permanent hair dyes bleach and add a new color to hair through the penetration of smaller dye precursors into the cortex and subsequent oxidation. [1]