Database/Colorant/CI 15865
Mostly petroleum · ISO 16128

Is CI 15865 natural?

Mostly not. Only the two sodium counter-ions are natural-origin; the chlorotoluene-sulfonate azo-naphthol dye skeleton is synthetic petrochemical.

INCI nameCI 15865
CAS3564-21-4
FormulaC18H11ClN2Na2O6S · 464.8 Da
FunctionColorant
FeedstockCI 15865 is a synthetic disodium monoazo dye…

How we scored it

Disodium naphthalene-azo-chlorotoluene-sulfonate: 2 Na = 45.98 Da / MW 464.8 Da = 0.099 natural (counter-ions only); the carboxynaphthol-diazenyl-chlorotoluenesulfonate backbone is 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

CI 15865 is a synthetic disodium monoazo dye built from a chlorotoluenesulfonic acid coupled to a carboxynaphthol, both petrochemical aromatic intermediates. Only the two sodium counter-ions (about 10% of molecular mass) are natural-origin.

In plain English

A synthetic red azo dye used to colour cosmetics, sold as its sodium salt. Almost entirely petroleum-derived; only a small mineral salt portion counts as natural.

CosIng definition: CI 15865 is classed chemically as a monoazo colour. It conforms to the formula:

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Structure

2D structure of CI 15865

disodium;2-[(3-carboxy-2-oxidonaphthalen-1-yl)diazenyl]-4-chloro-5-methylbenzenesulfonate

PubChem CID 135544134 ↗

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 15865. PubChem CID 135544134. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 15865. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 15865. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2015865