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Question
#94002. dj168
asks:
How does hair coloring work?
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randomguy55
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All "permanent" haircolor products and lighteners contain both a developer, or oxidizing agent, and an alkalizing ingredient as part of their ammonia or an ammonia substitute. The purpose of this is to:
* raise the cuticle of the hair fibre so the tint can penetrate,
* facilitate the formation of tints within the hair fibre,
* bring about the lightening action of peroxide.
When the tint containing the alkalizing ingredient is combined with the developer (usually hydrogen peroxide), the peroxide becomes alkaline and diffuses through the hair fibre, entering the cortex, where the melanin is located. The lightening occurs when the alkaline peroxide breaks up the melanin and replaces it with new color.
 http://en.wikipedia.org/wiki/Hair_coloring
Mar 27 08, 2:08 PM
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