Naphthol Yellow S is a chemical compound, a synthetic yellow dye also known as Acid Yellow 1, D&C Yellow No. 7, CI 10316

Chemical name: Disodium 5,7-dinitro-8-oxidonaphthalene-2-sulphonate and its insoluble barium, strontium and zirconium lakes, salts and pigments

What it is used for and where

Cosmetics

Colorant to avoid. It is an ingredient that makes the final product more attractive from an aesthetic point of view, but can pose a potential health risk with undesirable side effects especially when used continuously as it can be absorbed through the skin or mucous membranes.

Safety

It is an ingredient that has some important contraindications concerning the health profile: it should not enter the areas near the eyes.(Document 32009R1223. Regulation (EC) No 1223/2009 of the European Parliament and of the Council of 30 November 2009 on cosmetic products (recast) (Text with EEA relevance)

Molecular Formula   C₁₀H₄N₂Na₂O₈S

Molecular Weight   358.19 g/mol

CAS   846-70-8

EC number    212-690-2

UNII    08F8S9O3I5

DTXSID1041718

Synonyms: 

CI 10316

Acid yellow 1

Amacid Yellow S

Naphthol Yellow SXX

Kiton Yellow S

C.I. Food Yellow 1

Paper Yellow L

Kiton Yellow S

Solar Yellow NY

Ext. D & C yellow no. 7

Naphtol Yellow S

Sodium flavianate

Calcocid Yellow S

2-Naphthalenesulfonic acid, 8-hydroxy-5,7-dinitro-, disodium salt

Naphthol Yellow L

Ext. D&C Yellow No. 7

C.I. Acid Yellow 1

Rakuto Naphthol Yellow S