Database/Colorant/CI 16035
Mostly petroleum · ISO 16128

Is CI 16035 natural?

Mostly not. The two sulfonate-sodium groups count as mineral-origin, but the naphthalene/azo/methoxy backbone is a petrochemical aromatic dye skeleton.

INCI nameCI 16035
CAS25956-17-6
FormulaC18H14N2Na2O8S2 · 496.4 Da
FunctionColorant · Hair Dyeing
FeedstockAllura Red AC is synthesised from petrochemical aromatic…

How we scored it

Allura Red AC disodium salt C18H14N2Na2O8S2 496.4 Da: 2×SO3Na 206.1 Da natural (mineral) + petrochemical aromatic azo core 290.3 Da → 206.1/496.4 = 0.42.
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

Allura Red AC is synthesised from petrochemical aromatic amines and naphthol couplers via diazotisation, isolated as the disodium sulfonate salt. No natural production route exists.

In plain English

A synthetic red azo dye used to colour hair and cosmetic products. Manufactured from petrochemical aromatic chemicals, with the sodium sulfonate part of the molecule coming from mineral sulfur.

CosIng definition: CI 16035 is classed chemically as a monoazo colour. It conforms to the formula:

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Structure

2D structure of CI 16035

disodium;6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate

PubChem CID 33258 ↗

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 16035. PubChem CID 33258. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 16035. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 16035. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2016035