Why the score varies
This ingredient is made commercially by more than one route, and ISO 16128 scores the feedstock actually used. Without a supplier certificate of origin the value cannot be claimed.
| Route | Feedstock | NOI | Share | Notes |
|---|---|---|---|---|
| synthetic (Heumann/aniline process) | petrochemical aniline via phenylglycine route | 0.00 | majority, estimated 90%+ | |
| plant extraction | Indigofera tinctoria or Isatis tinctoria (woad) leaves, fermented and air-oxidised | 1.00 | minority, specialty/artisanal |
How we scored it
Where it comes from
Cosmetic-grade CI 73000 is predominantly manufactured synthetically from petrochemical aniline derivatives (Heumann process). A minority specialty supply is extracted from Indigofera tinctoria or woad leaves by fermentation.
In plain English
Indigo, the classic blue dye, used as a cosmetic colorant. Most commercial supply is made synthetically from chemical intermediates, though a small amount is still extracted from indigo-yielding plants.
CosIng definition: CI 73000 is classed chemically as an indigoid colour. It conforms to the formula:
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Structure
2-(3-hydroxy-1H-indol-2-yl)indol-3-one
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.
- 2CI 73000. PubChem CID 10215. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
- 3CI 73000. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
- 4CI 73000. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2073000