Green S

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Green S
Skeletal formula of Green S
Ball-and-stick model of Green S as a sodium salt
IUPAC name
Sodium 4-[(4-dimethylaminophenyl)-(4-dimethylazaniumylidene-1-cyclohexa-2,5-dienylidene)methyl]-3-hydroxynaphthalene-2,7-disulfonate
Other names
Food Green S; FD&C Green 4; Acid green 50; Lissamine Green B; Wool Green S; C.I. 44090; E142
3D model (JSmol)
ECHA InfoCard 100.019.463
E number E142 (colours)
Molar mass 576.62 g/mol
Melting point 210 °C (410 °F; 483 K) (decomposes)[1]
R-phrases (outdated) R22
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Green S is a green synthetic coal tar triarylmethane dye with the molecular formula C27H25N2O7S2Na.

As a food dye, it has E number E142. It can be used in mint sauce, desserts, gravy granules, sweets, ice creams, and tinned peas. Green S is prohibited as a food additive in Canada, United States, Japan, and Norway.[citation needed] It is approved for use as a food additive in the EU[2] and Australia and New Zealand.[3]

Green S is a vital dye, meaning it can be used to stain living cells. It is used in ophthalmology, among fluorescein and rose bengal, to diagnose various disorders of the eye's surface.

Green S may cause allergic reactions and is one of the colorants that the Hyperactive Children's Support Group recommends to be eliminated from the diet of children.[citation needed]


External links[edit]