Database/Colorant/Solvent Red 24
100% petroleum · ISO 16128

Is Solvent Red 24 natural?

No. Synthetic disazo colourant made by coupling petrochemical toluidine and naphthol intermediates; no natural production route exists.

INCI nameSolvent Red 24
CAS85-83-6
FormulaC24H20N4O · 380.4 Da
FunctionColorant
FeedstockProduced by azo coupling of petrochemical toluidine-type amines…

How we scored it

Whole molecule C24H20N4O is a disazo dye; naphthalene and toluidine rings from petrochemical aromatics, no natural fragment. 0/380=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

Produced by azo coupling of petrochemical toluidine-type amines with naphthol, both derived from petroleum or coal tar. No plant-based alternative route exists.

In plain English

A synthetic red dye colorant built entirely from lab-made naphthalene and toluidine-type aromatic chemicals derived from petroleum.

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Structure

2D structure of Solvent Red 24

1-[[2-methyl-4-[(2-methylphenyl)diazenyl]phenyl]diazenyl]naphthalen-2-ol

PubChem CID 62330 ↗

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 Red 24. PubChem CID 62330. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3SOLVENT RED 24. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4SOLVENT RED 24. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=SOLVENT%20RED%2024