Synthetic vs. natural
A color treatment can be synthetic or natural. Obviously the synthetic types have much more damage-potential than natural coloring agents.
The range of synthetic dyes
A permanent hair color uses hydrogen peroxide and/or an ammonia-based product to lift the hair cuticle and allow the dye to penetrate into the hair fibre. By lifting the hair's cuticle some protein and moisture is lost.
As hair colors become less permanent: semi-permanent to demi-permanent to temporary the strength and toxicity of the dye becomes lower. The least toxic synthetic coloring agent is the temporary type; this is because the molecules in the dye are too large to penetrate the hair cuticle - basically, the dye doesn't mess with hair natural structure.
There are three main types you can use: Henna, Cassia and Indigo
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By Heather Katsonga-Woodward
I was a natural hair blogger and mixtress living between London & Chicago from 2012 to 2017. I always thought I was 4C but some say 4B; images below - you decide! Heather xx