Preparation
Fluorescein (C.I. Acid Yellow 73, C.I. 45350) in aqueous solution with Iodine and Iodic Acid or with Iodine monochloride and alkali are two iodized, and?made into a free acid form.
Properties and Applications
yellow peach. Soluble in water for cherry red, no fluorescence. In concentrated sulfuric acid for brown light yellow, dilution after brown light yellow precipitation. Dye aqueous solution of sodium hydroxide to join a soluble red precipitation. Used for pharmaceutical and cosmetics coloring.
