Tartrazine is a synthetic lemon yellow azo dye primarily used as a food coloring .     It is also known as E number E102 , C.I. 19140 , FD&C Yellow 5 , Acid Yellow 23, Food Yellow 4, and trisodium 1-(4-sulfonatophenyl)-4-(4-sulfonatophenylazo)-5-pyrazolone-3-carboxylate). 
E-102 Gamma ( Ｅ－１０２ “ガンマ” , E-102 “Ganma” ? ) , or E-102 “γ” , is a fictional character in the Sonic the Hedgehog series . He is the second E-100 battle robot created by Dr. Eggman ,  but later gained his own sentience when he learned of friendship from Amy Rose and turned on his creator. He then assumed his own mission to 'free' his robot brethren from Eggman, and succeeded, though at the cost of his own life.