Database/Colorant/CI 16255
Mostly natural · ISO 16128

Is CI 16255 natural?

Mostly. Isomeric trisulfonated azo dye (same formula as CI 16185); sulfonate/sodium mass narrowly exceeds petrochemical backbone under the mineral counter-ion convention.

INCI nameCI 16255
CAS2611-82-7
FormulaC20H11N2Na3O10S3 · 604.5 Da
FunctionColorant · Hair Dyeing
FeedstockA trisodium naphthalene-trisulfonate azo hair dye made from…

How we scored it

MW 604.5: 3xSO3Na=309.18 mineral-natural; remaining trisulfonated naphthalene-diazo backbone 295.32 petrochemical -> 309.18/604.5=0.51.
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

A trisodium naphthalene-trisulfonate azo hair dye made from petrochemical naphthalenesulfonic acid intermediates. No natural route; result driven by sulfonate salt mass.

In plain English

A synthetic azo dye used to colour hair and cosmetics, made from petrochemical naphthalene chemicals with three sulfonate salt groups. A man-made colorant despite its mineral salt content.

CosIng definition: CI 16255 is classed chemically as a monoazo colour. It conforms to the formula:

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Structure

2D structure of CI 16255

trisodium;7-hydroxy-8-[(4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-1,3-disulfonate

PubChem CID 17466 ↗

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 16255. PubChem CID 17466. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 16255. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 16255. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2016255