Quinoline yellow, Quinoline Yellow WS, C.I. 47005, or Food Yellow 13, is a yellow food dye with a maximum absorption wavelength of 416 nmp. 119. Chemically it is a mixture of disulfonates (principally), monosulfonates and trisulfonates of 2-(2-quinolyl) indan-1,3-dione.
The color Quinoline Yellow SS (Spirit Soluble), which lacks the sulfonate groups, is a related form that is insoluble in water.
Read more about Quinoline Yellow WS: Uses, Health Effects
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—Voltaire [François Marie Arouet] (1694–1778)