ERYTHROSINE B 80% For Microscopy Red No. 3, Solvent Red 140, Acid Red 51, FD&C #3 C.I. Food Red 14; 3′,6′-Dihydroxy-2′,4′,5′,7′- tetraiodospiro[isobenzofuran-1(3H0,9′-[9H]xanthen]-3- one disodium salt C.I.No.45430 It is used as a food colouring, in printing inks, as a biological stain, a dental plaque disclosing agent and a radiopaque medium.