Database/Colorant/Pigment Orange 5
100% petroleum · ISO 16128

Is Pigment Orange 5 natural?

No. The diazo component (2,4-dinitroaniline) and the coupling component (2-naphthol) both come from petrochemical benzene and naphthalene, leaving no natural-origin atoms.

INCI namePigment Orange 5
CAS3468-63-1
FormulaC16H10N4O5 · 338.27 Da
FunctionColorant
FeedstockDiazotised 2,4-dinitroaniline is coupled with 2-naphthol, and the…

How we scored it

C16H10N4O5 338.3 Da: dinitrophenyl azo naphthol, entirely benzene and naphthalene chemistry with no natural fragment: 0/338.3 = 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

Diazotised 2,4-dinitroaniline is coupled with 2-naphthol, and the pigment is filtered and dried. No natural route exists.

In plain English

A synthetic orange azo pigment made from petroleum-derived 2,4-dinitroaniline and 2-naphthol. Used as a colorant, where the insoluble particles give colour to products.

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Structure

2D structure of Pigment Orange 5

1-[(2,4-dinitrophenyl)diazenyl]naphthalen-2-ol

PubChem CID 18981 ↗

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. 2Pigment Orange 5. PubChem CID 18981. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3PIGMENT ORANGE 5. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4PIGMENT ORANGE 5. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=PIGMENT%20ORANGE%205