Database/Colorant/CI 27290
100% petroleum · ISO 16128

Is CI 27290 natural?

No. Synthetic disazo hair-dye colorant built from petrochemical aromatic (aniline, naphthalene) intermediates; no natural fragments.

INCI nameCI 27290
CAS5413-75-2
FormulaC22H14N4Na2O7S2 · 556.5 Da
FunctionColorant · Hair Dyeing
FeedstockSynthesised by diazotising an aromatic amine and coupling…

How we scored it

Disazo naphthalene disulfonate hair dye; diazotised aniline coupled to a naphthol disulfonate, both aromatic petrochemical intermediates. Entirely synthetic.
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 by diazotising an aromatic amine and coupling it to a naphthalene disulfonic acid, both derived from petroleum-based benzene/naphthalene. No natural production route exists.

In plain English

A synthetic dye used to colour hair in permanent and semi-permanent hair dye products. Manufactured from petrochemical aromatic building blocks.

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Structure

2D structure of CI 27290

disodium;7-hydroxy-8-[(4-phenyldiazenylphenyl)diazenyl]naphthalene-1,3-disulfonate

PubChem CID 21519 ↗

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. 2CI 27290. PubChem CID 21519. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 27290. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 27290. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2027290