Database/Colorant/CI 18820
Mostly petroleum · ISO 16128

Is CI 18820 natural?

Mostly not. The sulfonate-sodium group counts as mineral-derived; the pyrazolone-azo-benzene backbone is entirely petrochemical aromatic chemistry.

INCI nameCI 18820
CAS6359-82-6
FormulaC16H13N4NaO4S · 380.4 Da
FunctionColorant
FeedstockSynthesised from petrochemical aniline and phenylpyrazolone precursors via…

How we scored it

1x SO3Na (mineral sulfonate) 103.05 Da natural + pyrazolone-phenyldiazenyl-benzene backbone 277.35 Da petrochemical; 103.05/380.4=0.27
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

Synthesised from petrochemical aniline and phenylpyrazolone precursors via diazotisation, then neutralised with sodium. No natural-isolation route exists.

In plain English

A synthetic dye used to colour cosmetics. Built from a petrochemical pyrazolone-aromatic backbone, with a mineral-derived sulfonate salt group.

CosIng definition: CI 18820 is classed chemically as a monoazo colour. It conforms to the formula:

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Structure

2D structure of CI 18820

sodium 4-(3-methyl-5-oxo-4-phenyldiazenyl-4H-pyrazol-1-yl)benzenesulfonate

PubChem CID 23675339 ↗

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 18820. PubChem CID 23675339. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 18820. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 18820. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2018820