Database/Colorant/CI 18736
Mostly petroleum · ISO 16128

Is CI 18736 natural?

Mostly not. Chromium-complex azo colour: the chromium centre and sodium ions are mineral-derived and count as natural under the site's metal-ion convention; the organic dye ligands are petrochemical.

INCI nameCI 18736
CAS6408-26-0
FormulaC34H27Cl2CrN8Na2O4+2 · 780.5 Da
FunctionColorant
FeedstockPetrochemical azo dye ligands complexed with a chromium…

How we scored it

CI 18736 C34H27Cl2CrN8Na2O4 780.5 Da: chromium 52.0 Da + 2 Na 46.0 Da (mineral, natural) = 98.0 Da; the pyrazolone-azo ligands and their ring chlorines (covalent, not credited) are petrochemical → 0.13.
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

Petrochemical azo dye ligands complexed with a chromium salt and isolated as the sodium salt.

In plain English

A synthetic chromium-complex dye used to colour cosmetics. Built almost entirely from petrochemical aromatic and chlorinated building blocks around a metal centre.

CosIng definition: CI 18736 is classed chemically as a monoazo colour. It is a chromium complex of the color that conforms to the formula:

Natural alternatives with the same function

Aluminum Powder 100% natural origin

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 Aluminum Stearate 100% natural origin

An aluminium salt of stearic acid, a fatty acid from vegetable or animal fat. Used to prevent caking,…

 Anthocyanins 100% natural origin

A natural colorant that gives products red, purple or blue tones. It is recovered from grape skins or…

 Calcium Ferrite 100% natural origin

A mineral pigment made of calcium and iron oxide, used as a colourant in cosmetics. It is produced…

 Calcium Stearate 100% natural origin

The calcium salt of stearic acid, a fatty acid usually from vegetable oils. Used as an anti-caking, thickening…

 Caramel 100% natural origin

A colouring and fragrance ingredient made by heating sugar, sucrose or glucose, until it browns. It comes from…

Structure

2D structure of CI 18736

disodium;bis(4-chloro-2-methyl-6-[(3-methyl-5-oxo-1-phenylpyrazol-2-id-4-yl)diazenyl]phenolate);chromium(3+);hydron

PubChem CID 11979831 ↗

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 18736. PubChem CID 11979831. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 18736. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 18736. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2018736