Database/Hair Dyeing/Pigment Red 112
100% petroleum · ISO 16128

Is Pigment Red 112 natural?

No. 2,4,5-Trichloroaniline and the naphthol AS-D coupling component derive from petrochemical benzene, naphthalene and toluidine, and the pigment has no mineral counter-ion.

INCI namePigment Red 112
CAS6535-46-2
FormulaC24H16Cl3N3O2 · 484.8 Da
FunctionHair Dyeing
FeedstockDominant route diazotises 2,4,5-trichloroaniline and couples it with…

How we scored it

C24H16Cl3N3O2 = 484.8 Da; metal-free naphthol AS azo pigment, all atoms from petrochemical aromatics (trichloroaniline, naphthol AS-D; aryl chlorine counted with framework): 0/484.8 = 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

Dominant route diazotises 2,4,5-trichloroaniline and couples it with 3-hydroxy-N-(2-methylphenyl)-2-naphthamide, all petrochemical aromatics. No natural-origin route exists.

In plain English

A synthetic red organic pigment (a naphthol AS azo colour) used to colour products, listed for hair dyeing. It is made from petrochemical aromatic chemicals, including chlorinated ones, and has no mineral part.

CosIng definition: Pigment Red 112 is classed chemically as a monoazo colour. It conforms to the formula:

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Structure

2D structure of Pigment Red 112

3-hydroxy-N-(2-methylphenyl)-4-[(2,4,5-trichlorophenyl)diazenyl]naphthalene-2-carboxamide

PubChem CID 23034 ↗

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 Red 112. PubChem CID 23034. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3PIGMENT RED 112. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4PIGMENT RED 112. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=PIGMENT%20RED%20112