Database/Colorant/CI 15510
Mostly petroleum · ISO 16128

Is CI 15510 natural?

Mostly not. Naphthol-azo chromophore is synthetic aromatic chemistry; only the sodium sulfonate fragment is mineral-origin.

INCI nameCI 15510
CAS633-96-5
FormulaC16H11N2NaO4S · 350.3 Da
FunctionColorant
FeedstockSynthetic monoazo acid dye made by coupling diazotized…

How we scored it

SO3Na sulfonate fragment (natural, 103 Da) + hydroxynaphthalene-azo-benzene chromophore (petrochemical, 247 Da) = 103/350 = 0.29
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

Synthetic monoazo acid dye made by coupling diazotized sulfanilic acid with 2-naphthol, both from petrochemical aromatics. Only the sulfonate salt fragment is natural-origin under ISO mass-balance.

In plain English

A synthetic orange dye used to colour cosmetic products, manufactured from man-made aromatic chemical intermediates and turned into a sodium salt.

CosIng definition: CI 15510 is classed chemically as a monoazo colour. It conforms to the formula:

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Structure

2D structure of CI 15510

sodium 4-[(2-hydroxynaphthalen-1-yl)diazenyl]benzenesulfonate

PubChem CID 135442941 ↗

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 15510. PubChem CID 135442941. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 15510. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 15510. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2015510