Green S

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Green S
Skeletal formula of Green S
Ball-and-stick model of Green S as a sodium salt
Names
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
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.019.463
E number E142 (colours)
UNII
Properties
C27H25N2NaO7S2
Molar mass 576.62 g/mol
Melting point 210 °C (410 °F; 483 K) (decomposes)[1]
Hazards
R-phrases (outdated) R22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, along with fluorescein and rose bengal, to diagnose various disorders of the eye's surface, dry eyes for example.

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]

References[edit]

External links[edit]