Database/Colorant/CI 15620
Mostly petroleum · ISO 16128

Is CI 15620 natural?

Mostly not. Two naphthalene units from coal-tar or petroleum and the azo nitrogens from ammonia-derived nitrite are petrochemical; the sulfonate and sodium are mineral-derived.

INCI nameCI 15620
CAS1658-56-6
FormulaC20H13N2NaO4S · 400.4 Da
FunctionColorant
FeedstockMade by diazotising naphthionic acid (4-amino-1-naphthalenesulfonic acid) and…

How we scored it

C20H13N2NaO4S 400.4 Da: SO3Na (sulfonate + Na) 103.1 Da natural; naphthyl rings, azo N=N and naphthol part 297.3 Da petrochemical. 103.1 / 400.4 = 0.26.
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

Made by diazotising naphthionic acid (4-amino-1-naphthalenesulfonic acid) and coupling it with 2-naphthol, both from coal-tar or petroleum naphthalene. No natural-origin route exists.

In plain English

A red synthetic azo dye (Acid Red 88) that colours products orange-red to red. It is made in factories from naphthalene-based chemicals derived from coal tar or petroleum, and carries a sodium sulfonate group that lets it dissolve in water.

CosIng definition: CI 15620 is classed chemically as a monoazo colour. It conforms to the formula:

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Structure

2D structure of CI 15620

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

PubChem CID 135465069 ↗

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 15620. PubChem CID 135465069. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 15620. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 15620. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2015620