Database/Colorant/CI 10020
Mostly petroleum · ISO 16128

Is CI 10020 natural?

Mostly not. Sulfonate groups, sodium and iron are mineral; the naphthalene rings and nitroso groups come from petroleum or coal-tar naphthalene and nitrite chemistry, so they count as petrochemical framework.

INCI nameCI 10020
CAS19381-50-1
FormulaC30H15FeN3Na3O15S3 · 878.5 Da
FunctionColorant
FeedstockDominant route: 2-naphthol-6-sulfonic acid is nitrosated and complexed…

How we scored it

C30H15FeN3Na3O15S3 878.5: three SO3 240.2 + three Na 69.0 + Fe 55.8 = 365.0 mineral; naphthalene and nitroso framework 513.5 petrochemical; 365.0/878.5 = 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

Dominant route: 2-naphthol-6-sulfonic acid is nitrosated and complexed with an iron salt, then isolated as the sodium salt. No alternative route is commercially significant.

In plain English

A green colourant (Acid Green 1, also called Naphthol Green B): an iron complex of a sulfonated nitroso-naphthol, sold as its sodium salt. It colours cosmetics. It is made synthetically from naphthalene-based chemicals.

CosIng definition: CI 10020 is classed chemically as a nitroso colour. It conforms to the formula:

Natural alternatives with the same function

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Structure

2D structure of CI 10020

trisodium;iron(3+);tris(5-nitroso-6-oxidonaphthalene-2-sulfonate)

PubChem CID 6915910 ↗

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 10020. PubChem CID 6915910. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 10020. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 10020. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2010020