D&C Green No. 5 is also called Acid Green 25 or CI 61570 and is a synthetic green dye used in pharmaceuticals and cosmetics.

The name defines the structure of the molecule:

• D&C stands for Drugs and Cosmetics. These letters are used to indicate that the FDA has approved these colors for use in medicines and cosmetics, but not in foods.
• Green No. 5 is the specific number assigned to this dye.

Cosmetics

CI 61570  is a restricted ingredient as  IV/92 a Relevant Item in the Annexes of the European Cosmetics Regulation 1223/2009. Ingredient at risk: Disodium 2,2'-(9,10-dioxoanthracene-1,4-diyldiimino)bis(5-methylsulphonate)

Colorant. This ingredient has the function of colouring the solution in which it is inserted in a temporary, semi-permanent or permanent manner, either alone or in the presence of the complementary components added for colouring.

CI 61570, studies

• Molecular Formula   C₂₈H₂₀N₂Na₂O₈S₂
• Molecular Weight  622.58
• CAS  4403-90-1
• EINECS 224-546-6

Synonyms:

• Acid Green 25
• Alizarin Cyanine Green F
• Erionyl Green GL
• Alizarine Green J
• Aquamine Green GL
• Disodium 2,2'-(9,10-dioxoanthracene-1,4-diyldiimino)bis(5-methylsulphonate)
• Benzenesulfonic acid, 2,2'-((9,10-dihydro-9,10-dioxo-1,4-anthracenediyl)diimino)bis(5-methyl-, disodium salt
• 2,2'-(1,4-Anthraquinonylenediimino)bis(5-methylbenzenesulfonic acid) disodium salt
• 1,4-Bis(o-sulfo-p-toluino)anthraquinone, disodium salt
• m-Toluenesulfonic acid, 6,6'-(1,4-anthraquinonylenediimino)di-, disodium salt
• disodium 5-methyl-2-[[4-(4-methyl-2-sulfonatoanilino)-9,10-dioxoanthracen-1-yl]amino]benzenesulfonate
• sodium 6,6'-(9,10-dioxo-9,10-dihydroanthracene-1,4-diyl)bis(azanediyl)bis(3-methylbenzenesulfonate)
• dipotassium 5-methyl-2-({4-[(4-methyl-2-sulfonatophenyl)amino]-9,10-dioxoanthracen-1-yl}amino)benzenesulfo