Database/Colorant/CI 21100
100% petroleum · ISO 16128

Is CI 21100 natural?

No. Complex chlorinated disazo colorant synthesised from petrochemical aromatic amine intermediates; no natural fragments.

INCI nameCI 21100
CAS5102-83-0
FormulaC36H34Cl2N6O4 · 685.6 Da
FunctionColorant
FeedstockSynthesised by diazotising chlorinated aromatic amines and coupling…

How we scored it

Disazo dye from chlorinated aniline and dimethylaniline intermediates; aromatic-amine diazo-coupling chemistry, entirely petrochemical.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

Synthesised by diazotising chlorinated aromatic amines and coupling them to a dimethylaniline-based acceptor, all derived from petroleum-based benzene chemistry. No natural production route exists.

In plain English

An orange-red synthetic dye used to colour cosmetic and personal care products. Manufactured entirely from petrochemical aromatic building blocks.

CosIng definition: CI 21100 is classed chemically as a disazo colour. It conforms to the formula:

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Structure

2D structure of CI 21100

2-[[2-chloro-4-[3-chloro-4-[[1-(2,4-dimethylanilino)-1,3-dioxobutan-2-yl]diazenyl]phenyl]phenyl]diazenyl]-N-(2,4-dimethylphenyl)-3-oxobutanamide

PubChem CID 73462 ↗

References

  1. 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.
  2. 2CI 21100. PubChem CID 73462. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 21100. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 21100. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2021100