Defination: The color additive D&C Yellow No. 10 is a mixture of the sodium \nsalts of the mono- and disulfonic acids of 2-(2-quinolinyl)-1 H \n-indene-1,3 (2 H )-dione consisting principally of the sodium salts of \n2-(2,3-dihydro-1,3-dioxo-1 H -indene-2-yl)-6-quinolinesulfonic acid and\n 2-(2,3-dihydro-1,3-dioxo-1 H -indene-2-yl)-8-quinolinesulfonic acid \nwith lesser amounts of the disodium salts of the disulfonic acids of