Tartrazine Colour Shade Synonyms Food Yellow - 4 Chemical Name Tri-sodium 5-hydroxy-1-(4-Sulfonato phenyl-4-(4-Sulfonato phenylazo) pyrazole-3-carbaxylate C.I. No 19140 C.I. Name Acid Yellow- 23 FDA Status FD&C Yellow - 5 CAS No. 1934-21-0 EINECS No. 217-699-5 E.