Fluorescein sodium salt is an orange-red to dark red powder. Water-soluble form of fluorescein.A phthalic indicator dye that appears yellow-green in normal tear film and bright green in a more alkaline medium such as the aqueous humor.
Fluorescein is a xanthene dye and is a common labeling agent in biology .Fluorescein sodium salt is Orange-red to dark red powder. Water-soluble form of fluorescein. Odorless and almost tasteless. pH (5% solution) 7.8. May be sensitive to prolonged exposure to light and to heat.