Database/Colorant/Solvent Yellow 33
100% petroleum · ISO 16128

Is Solvent Yellow 33 natural?

No. Made from petrochemical phthalic anhydride reacted with quinoline and methylquinoline; no natural-origin building blocks.

INCI nameSolvent Yellow 33
CAS8003-22-3
FormulaC18H11NO2 · 273.3 Da
FunctionColorant · Hair Dyeing
FeedstockSolvent Yellow 33 (Quinoline Yellow, CI 47000) is…

How we scored it

Quinoline/methylquinoline + phthalic anhydride condensation dye, entirely petrochemical aromatics → 0/total = 0.0
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

Solvent Yellow 33 (Quinoline Yellow, CI 47000) is manufactured by condensing petrochemical phthalic anhydride with quinoline and methylquinoline. There is no natural-origin production route.

In plain English

A synthetic yellow dye used to colour hair or cosmetics. It is made from petrochemical aromatic chemicals and has no natural source.

CosIng definition: 1,3-Isobenzofurandione, reaction products with methylquinoline and quinoline (CI 47000)

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Structure

2D structure of Solvent Yellow 33

2-quinolin-2-ylindene-1,3-dione

PubChem CID 6731 ↗

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. 2Solvent Yellow 33. PubChem CID 6731. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3SOLVENT YELLOW 33. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4SOLVENT YELLOW 33. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=SOLVENT%20YELLOW%2033