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How does hair dye work?

Updated: 8/16/2019
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14y ago

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Temporary dye: It lies on the outside of the hair, not changing the colour but looks like a change and it can be washed off straight away because of this. It has no peroxode in it. It doesn't cover gray effectively. Semi permanent dye: It also has no peroxide in it but it sits under the cuticle (the outside layer of the hair) and doesn't physically change the colour of the hair. It lasts 6-8 weeks. It doesn't cover gray effectively. Quasi permanent dye: It has a small amount of peroxide in it and it enters the cuticle and sits just inside it. Peroxide makes it swell and opens the cuticle of the hair. It changes the physical colour a little. It can last up to 24 weeks. It can cover gray. Permanent dye: It has more peroxide in it and it makes the colour go into the cortex (main part of the hair inside the cuticle). It takes the natural colour out and deposits the new colour in there. This is permanent so you have to wait for this colour to grow out to see your natural colour again. Will cover gray effectively. To see the internal structure of hair, to see the cuticle and cortex, check related links below.

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14y ago
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Q: How does hair dye work?
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