Database/Hair Dyeing/Pigment Red 88
100% petroleum · ISO 16128

Is Pigment Red 88 natural?

No. A chlorinated thioindigo dye built from petrochemical benzene derivatives; carbon-bonded chlorine and sulfur sit in the petrochemical framework, leaving no natural-origin mass.

INCI namePigment Red 88
CAS14295-43-3
FormulaC16H4Cl4O2S2 · 434.1 Da
FunctionHair Dyeing
FeedstockSynthesised from chlorinated aromatic thiophenol precursors derived from…

How we scored it

C16H4Cl4O2S2 434 Da: chlorinated thioindigo framework (aromatic, carbon-bonded Cl and S) entirely petrochemical; natural 0 / 434.1 = 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

Synthesised from chlorinated aromatic thiophenol precursors derived from benzene, then cyclised and oxidatively dimerised. No natural or bio-based route is known.

In plain English

A synthetic red-violet vat dye (tetrachlorothioindigo) listed for hair colouring. It is made from chlorinated aromatic petrochemical building blocks.

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Structure

2D structure of Pigment Red 88

(2E)-4,7-dichloro-2-(4,7-dichloro-3-oxo-1-benzothiophen-2-ylidene)-1-benzothiophen-3-one

PubChem CID 13643300 ↗

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 88. PubChem CID 13643300. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3PIGMENT RED 88. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4PIGMENT RED 88. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=PIGMENT%20RED%2088