Database/Colorant/CI 11920
100% petroleum · ISO 16128

Is CI 11920 natural?

No. Aniline and resorcinol are petrochemical benzene derivatives and the azo link joins them, so every atom is non-natural origin.

INCI nameCI 11920
CAS2051-85-6
FormulaC12H10N2O2 · 214.22 Da
FunctionColorant
FeedstockDominant route: aniline is diazotised and coupled with…

How we scored it

C12H10N2O2, 214.2 Da: aniline-derived ring, azo N=N link and resorcinol ring are all benzene-based petrochemical framework; natural mass 0, so 0/214.2 = 0.00.
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: aniline is diazotised and coupled with resorcinol, both made from petroleum benzene. No natural-origin route is commercially significant.

In plain English

CI 11920 (Solvent Orange 1, 4-phenylazoresorcinol) is a synthetic orange azo dye used as a colourant. It is built from aniline and resorcinol, both benzene derivatives from petroleum.

CosIng definition: CI 11920 is classed chemically as a monoazo colour. It conforms to the formula:

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Structure

2D structure of CI 11920

4-phenyldiazenylbenzene-1,3-diol

PubChem CID 16325 ↗

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 11920. PubChem CID 16325. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 11920. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 11920. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2011920