Database/Hair Dyeing/Acid Yellow 73 Sodium Salt
100% petroleum · ISO 16128

Is Acid Yellow 73 Sodium Salt natural?

No. Two names for one colorant carry one value; the calculation is on the CI 45350 page.

INCI nameAcid Yellow 73 Sodium Salt
CAS518-47-8
FormulaC20H10Na2O5 · 376.3 Da
FunctionHair Dyeing
FeedstockFluorescein made from petrochemical resorcinol and phthalic anhydride,…

How we scored it

This name and CI 45350 are two listings of the same colorant, so it carries that entry's value: 0.00.
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

Fluorescein made from petrochemical resorcinol and phthalic anhydride, sold as its sodium salt.

In plain English

Fluorescein sodium (uranine), a yellow-green fluorescent dye listed for hair dyeing. It is made synthetically from petrochemical aromatic chemicals and sold as a water-soluble sodium salt.

CosIng definition: Acid Yellow 73 Sodium Salt is classed chemically as a xanthene colour. It conforms to the formula:

Natural alternatives with the same function

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 Bismuth Citrate 100% natural origin

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 Dihydroxyacetone 100% natural origin

The active self-tanning ingredient that reacts with skin's surface proteins to produce a temporary bronze colour; made by…

 Epicatechin 100% natural origin

An antioxidant compound naturally found in tea and cocoa, used in skin, hair and oral care. It's extracted…

 Lawsonia Inermis Extract 100% natural origin

A plant extract from the henna shrub, used to condition hair and skin and add a reddish tint.…

 Pyrogallol 100% natural origin

A hair-dye ingredient traditionally made by heating gallic acid, itself extracted from plant tannins in gallnuts, until it…

Structure

2D structure of Acid Yellow 73 Sodium Salt

disodium;2-(3-oxido-6-oxoxanthen-9-yl)benzoate

PubChem CID 10608 ↗

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 Yellow 73 Sodium Salt. PubChem CID 10608. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3ACID YELLOW 73 SODIUM SALT. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4ACID YELLOW 73 SODIUM SALT. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=ACID%20YELLOW%2073%20SODIUM%20SALT