Database/Colorant/Pigment Red 53:1
Mostly petroleum · ISO 16128

Is Pigment Red 53:1 natural?

Mostly not. Barium and the two sulfonate groups are treated as mineral origin, whereas the chlorinated toluene amine, azo link and 2-naphthol parts are petrochemical.

INCI namePigment Red 53:1
CAS5160-02-1
FormulaC34H24BaCl2N4O8S2 · 888.9 Da
FunctionColorant
FeedstockMade by diazotising 2-amino-5-chloro-4-methylbenzenesulfonic acid (from petrochemical toluene)…

How we scored it

C34H24BaCl2N4O8S2 889 Da. Natural: Ba 137 + 2 x SO3 160 = 297 Da; chlorotoluene-sulfonic acid, azo and naphthol skeleton incl. ring Cl petrochemical. 297/889 = 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

Made by diazotising 2-amino-5-chloro-4-methylbenzenesulfonic acid (from petrochemical toluene) and coupling it with 2-naphthol, then laking with barium chloride. No natural-origin route exists, and barium is a mined mineral counter-ion.

In plain English

A red pigment used to colour make-up and other products. It is a synthetic azo dye made from petrochemical aromatic chemicals and precipitated as a barium salt so it does not dissolve.

CosIng definition: Pigment Red 53:1 is classed chemically as a monoazo color. It conforms to the formula (This color is the barium salt of Pigment Red 53).

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Structure

2D structure of Pigment Red 53:1

barium(2+);bis(5-chloro-2-[(2-hydroxynaphthalen-1-yl)diazenyl]-4-methylbenzenesulfonate)

PubChem CID 21238 ↗

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. 2Pigment Red 53:1. PubChem CID 21238. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3PIGMENT RED 53:1. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4PIGMENT RED 53:1. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=PIGMENT%20RED%2053%3A1