Database/Colorant/CI 15850
Mostly petroleum · ISO 16128

Is CI 15850 natural?

Mostly not. The sulfonate-sodium group and the carboxylate's sodium ion are mineral-origin; the naphthalene-azo-carboxylic backbone is petrochemical aromatic chemistry.

INCI nameCI 15850
CAS5858-81-1
FormulaC18H12N2Na2O6S · 430.3 Da
FunctionColorant · Hair Dyeing
FeedstockD&C Red 6 is synthesised from petrochemical aromatic…

How we scored it

D&C Red 6 disodium salt C18H12N2Na2O6S 430.4 Da: SO3Na 103.1 Da + carboxylate Na+ 23.0 Da natural (mineral) = 126.0 Da; petrochemical naphthalene-azo-carboxyl core 304.3 Da → 126.0/430.4 = 0.29.
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

D&C Red 6 is synthesised from petrochemical aromatic amines and naphthol-carboxylic couplers via diazotisation, isolated as the disodium 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 only the sodium and sulfonate portions being mineral-derived.

CosIng definition: CI 15850 is classed chemically as a monoazo colour. It conforms to the formula:

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Structure

2D structure of CI 15850

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

PubChem CID 135487652 ↗

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 15850. PubChem CID 135487652. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 15850. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 15850. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2015850