Database/Colorant/CI 18050
Mostly petroleum · ISO 16128

Is CI 18050 natural?

Mostly not. Only the two sodium counter-ions are natural; the acetamido-naphthalene-disulfonate azo dye backbone, including its acetyl cap, is synthetic petrochemical.

INCI nameCI 18050
CAS3734-67-6
FormulaC18H13N3Na2O8S2 · 509.4 Da
FunctionColorant
FeedstockCI 18050 is a synthetic disodium monoazo dye…

How we scored it

Disodium acetamido-hydroxy-phenyldiazenyl-naphthalenedisulfonate: 2 Na = 45.98 Da / MW 509.4 Da = 0.090 natural (counter-ions only); the acetamido-naphthalenedisulfonate-azo backbone, including its acetyl cap, 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 18050 is a synthetic disodium monoazo dye (an acetamido-hydroxy-naphthalene disulfonate coupled to phenyldiazenyl) built from petrochemical aniline, naphthalenesulfonic acid, and acetic anhydride intermediates. Only the two sodium counter-ions are natural-origin.

In plain English

A synthetic yellow azo dye, sold as a sodium salt, used to colour cosmetics. Almost entirely built from petroleum-derived chemicals; only a small mineral salt portion is natural.

CosIng definition: CI 18050 is classed chemically as a monoazo colour. It conforms to the formula:

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Structure

2D structure of CI 18050

disodium;5-acetamido-4-hydroxy-3-phenyldiazenylnaphthalene-2,7-disulfonate

PubChem CID 19522 ↗

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 18050. PubChem CID 19522. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 18050. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 18050. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2018050