Erythrosine comprises benzoate monohydrate, disodium 2-(2,4,5,7-tetraiodo-3-oxidooxoxanthen-9-y1) as well as its subsidiary coloring matter with sodium chloride, water as well as sodium sulfate that work as principal uncolored components. The organic compounds other than coloring matters it contains include Tri-iodoresorcinol (Not more than 0.2%) and 2-(2,4-dihydroxy-3,5-diodobenzoic acid (Not more than 0.2%).