Database/Colorant/Acid Black 1
Mostly petroleum · ISO 16128

Is Acid Black 1 natural?

Mostly not. Disazo naphthalene chromophore is petrochemical; the two sulfonate salt groups are counted as mineral-origin.

INCI nameAcid Black 1
CAS1064-48-8
FormulaC22H14N6Na2O9S2 · 616.5 Da
FunctionColorant
FeedstockSynthesised from petrochemical naphthalene and aromatic amine intermediates…

How we scored it

Amido Black 10B, MW 616.5 (C22H14N6Na2O9S2); 2x SO3Na ~206Da natural (mineral) / ~410Da disazo-naphthalene backbone petrochemical; 206/616=0.33
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 from petrochemical naphthalene and aromatic amine intermediates via double diazotisation/coupling. No natural production route.

In plain English

A black synthetic dye used to colour cosmetics, made through industrial coupling of petroleum-derived aromatic chemicals.

CosIng definition: Acid Black 1 is classed chemically as a disazo color. It conforms to the formula. To identify the colorant allowed for use in the European Union (EU), the INCI Name CI 20470 must be used, except for hair dye products.

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Structure

2D structure of Acid Black 1

disodium;4-amino-5-hydroxy-3-[(4-nitrophenyl)diazenyl]-6-phenyldiazenylnaphthalene-2,7-disulfonate

PubChem CID 135442942 ↗

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 1. PubChem CID 135442942. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3ACID BLACK 1. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4ACID BLACK 1. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=ACID%20BLACK%201