Naked Science Forum

Non Life Sciences => Chemistry => Topic started by: Craftybutterfly on 27/01/2018 04:36:36

Title: Would adding hydrogen peroxide to henna hair dye lighten the final colour?
Post by: Craftybutterfly on 27/01/2018 04:36:36

If using henna hair dye would adding hydrogen peroxide to the dye mixture lighten the final color? Would it be better to lighten the hair first? Any suggestions would be appreciated.

Title: Re: Would adding hydrogen peroxide to henna hair dye lighten the final colour?
Post by: Bored chemist on 27/01/2018 16:06:18

The easiest way to get a less intense henna colour would be to use less henna.

Title: Re: Would adding hydrogen peroxide to henna hair dye lighten the final colour?
Post by: Craftybutterfly on 27/01/2018 21:18:44

I should have made my question more clear, the hair I am trying to color is brown and I am trying to get it to be a bright red. Using less henna would just presumably make it less effective. I’m trying to achieve a brighter red finished color.

Title: Re: Would adding hydrogen peroxide to henna hair dye lighten the final colour?
Post by: Bored chemist on 28/01/2018 09:24:03

If you bleach it after you dye it, you will bleach out the henna.
So it makes sense to bleach it first.
(The usual precautions about hair dyes, patch testing etc apply.)

Title: Re: Would adding hydrogen peroxide to henna hair dye lighten the final colour?
Post by: adianadiadi on 29/01/2018 00:23:14

Peroxide will oxidize henna and the molecules that are responsible for making hair red. That means henna no longer be effective.