FD&C Red 3 consists essentially of disodium 2-(2,4,5,7-tetraiodo-3- oxido-6-oxoxanthen-9-yl) benzoate monohydrate and subsidiary colouring matters together with water, sodium chloride and/or sodium sulphate as the principal uncoloured components.
FD&C Red 3 is manufactured by iodination of fluorescein, the condensation product of resorcinol and phthalic anhydride
Chemical name: Disodium 2-(2,4,5,7-tetraiodo-3-oxido-6-oxoxanthen-9-yl)benzoate monohydrate
Other name: CI Food Red 14, FD&C Red No. 3; CI (1975): 45430; INS 127, Erythrosine
