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| Names | |
|---|---|
| IUPAC name Sodium 4-[(4-dimethylaminophenyl)-(4-dimethylazaniumylidene-1-cyclohexa-2,5-dienylidene)methyl]-3-hydroxynaphthalene-2,7-disulfonate | |
Other names
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| Identifiers | |
3D model (JSmol) | |
| ChemSpider |
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| ECHA InfoCard | 100.019.463 |
| E number | E142(colours) |
| UNII | |
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| Properties | |
| C27H25N2NaO7S2 | |
| Molar mass | 576.62 g/mol |
| Melting point | 210 °C (410 °F; 483 K) (decomposes)[1] |
| Hazards | |
| GHS labelling:[2] | |
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| Warning | |
| H302,H315,H319,H335 | |
| P261,P305+P351+P338 | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Green S is a green syntheticcoal tar triarylmethanedye with the molecular formula C27H25N2O7S2Na.
As afood dye, it hasE number E142. It can be used inmint sauce,desserts,gravy granules,sweets,ice creams, and tinnedpeas. Green S is prohibited as a food additive inCanada,United States,Japan, andNorway.[3] It is approved for use as afood additive in the EU[4] and Australia and New Zealand.[5]
Green S is avital dye, meaning it can be used tostain livingcells. It is used inophthalmology, along withfluorescein androse bengal, to diagnose various disorders of the eye's surface, dry eyes for example.
