FLUORESCEIN SODIUM
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(New page: frame Fluorescein is a common fluochrome dye; a yellowish to red crystalline powder; insoluble in water; soluble in dilute acids, and dilute alkali. It is...)
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Revision as of 09:10, 24 October 2008
Fluorescein is a common fluochrome dye; a yellowish to red crystalline powder; insoluble in water; soluble in dilute acids, and dilute alkali. It is obtained from the condensation of phthalic anhydride with resorcin on heating. It is used in dying silk and wool. It is the parent compound of eosin. All eosins are bromine derivatives of fluorescin, used in dyeing textiles, ink manufacturing, in coloring cosmetics, in coloring gasoline and as a toner. Eosin is a composition of Wright stain, in modified Nocht's stain and eosin-methylene blue medium. The sodium salt of fluorescein is called uranine which are used in dying silk and wool, in oceanography as a marker in sea water, and in coloring agrochemicals, fertilizers, detergents and antifreezers. Fluorescein sodium (uranine) is an orange-red crystalline powder; odorless, water-soluble.
Properties
| PHYSICAL STATE | orange to red powder, odourless |
| MELTING POINT | > 314 C |
| SOLUBILITY IN WATER | Freely Souluble (600 g/l) |
| SOLVENT SOLUBILITY | MEG (500), DEG (550), PG (300), Glycerol (700), Methanol (230), Ethanol (45), Methoxyethanol (300) |
| pH | 8 - 9.8 |
| NFPA RATINGS | Health: 1 Flammability: 0 Reactivity: 0 |
| STABILITY | stable under ordinary conditions. |
