How we scored it
Where it comes from
Manufactured synthetically from petroleum-derived aniline-type precursors via indole ring synthesis. Used as a hair-dye coupler with no natural alternative.
In plain English
A synthetic dye ingredient made from petroleum feedstocks, used as a colour-developing coupler in permanent hair dyes.
Natural alternatives with the same function
A powder made by drying and grinding sugar beet root. Used as a natural colorant for hair dye…
Bismuth Citrate 100% natural originA salt formed from bismuth metal and citric acid, a natural fermentation-derived fruit acid, used to buffer, chelate…
Dihydroxyacetone 100% natural originThe active self-tanning ingredient that reacts with skin's surface proteins to produce a temporary bronze colour; made by…
Epicatechin 100% natural originAn antioxidant compound naturally found in tea and cocoa, used in skin, hair and oral care. It's extracted…
Lawsonia Inermis Extract 100% natural originA plant extract from the henna shrub, used to condition hair and skin and add a reddish tint.…
Pyrogallol 100% natural originA hair-dye ingredient traditionally made by heating gallic acid, itself extracted from plant tannins in gallnuts, until it…
Structure
1H-indol-6-ol
References
- 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
- 26-Hydroxyindole. PubChem CID 524508. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
- 36-HYDROXYINDOLE. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
- 46-HYDROXYINDOLE. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=6-HYDROXYINDOLE