Database/Hair Dyeing/Acid Black 52
Mostly petroleum · ISO 16128

Is Acid Black 52 natural?

Mostly not. Chromium-complex azo dye. The sulfonate groups, sodium ions and the chromium centre are mineral-derived and count as natural under the site's counter-ion and metal-ion convention; the organic dye ligands are petrochemical.

INCI nameAcid Black 52
CAS5610-64-0
FormulaC60H30Cr2N9Na3O21S3 · 1482.1 Da
FunctionHair Dyeing
FeedstockPetrochemical azo dye ligands complexed with a mineral…

How we scored it

Acid Black 52 C60H30Cr2N9Na3O21S3 1482.1 Da: 3×SO3 240.2 Da + 3×Na 69.0 Da + 2×Cr 104.0 Da (mineral chromium, credited like other metal ions) = 413.1 Da natural; the azo-naphthalene ligands are petrochemical → 0.28.
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

Petrochemical azo dye ligands complexed with a mineral chromium salt, isolated as the sodium salt.

In plain English

A synthetic black dye used to colour hair, based on a chromium-azo complex built from petrochemical naphthalene compounds; only its sodium and sulfonate portions are mineral-derived.

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Structure

2D structure of Acid Black 52

trisodium;bis(chromium(3+));tris(7-nitro-3-oxido-4-[(2-oxidonaphthalen-1-yl)diazenyl]naphthalene-1-sulfonate)

PubChem CID 76960928 ↗

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. 2Acid Black 52. PubChem CID 76960928. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3ACID BLACK 52. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4ACID BLACK 52. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=ACID%20BLACK%2052