Database/Colorant/CI 50420
Mostly petroleum · ISO 16128

Is CI 50420 natural?

Mostly not. Sodium and the four sulfonate groups count as natural/mineral; the nigrosine phenazine dye core is a petrochemical aromatic.

INCI nameCI 50420
CAS8005-03-6
FormulaC42H29N6Na3O12S4 · 1006.9 Da
FunctionColorant
FeedstockA sulfonated nigrosine (phenazine) dye made from petrochemical…

How we scored it

Na3 (69) + 4xSO3 (S+3O=80 each, 320) = 389 Da natural; phenazinium/anilino core (618 Da) petrochemical. 389/1006.9=0.39.
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

A sulfonated nigrosine (phenazine) dye made from petrochemical aromatic amines, sold as its trisodium salt. No natural-origin route exists.

In plain English

A sulfonated nigrosine-type synthetic dye, sold as a sodium salt, used to colour cosmetics. The core dye structure is built from petrochemical aromatic amines.

CosIng definition: CI 50420 is classed chemically as a sulfonated nigrosine colour.

Natural alternatives with the same function

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 Calcium Ferrite 100% natural origin

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 Calcium Stearate 100% natural origin

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Structure

2D structure of CI 50420

trisodium;4-[[5-phenyl-3,7,8-tris(4-sulfonatoanilino)phenazin-5-ium-2-yl]amino]benzenesulfonate

PubChem CID 171390202 ↗

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 50420. PubChem CID 171390202. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 50420. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 50420. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2050420