Wachikasu Yellow AB (Fast Yellow AB, Acid Yellow G, Acid Yellow, Fast Yellow, Food Yellow 2, E105) ndi utoto wachikasu wa chakudya. Chemical formula C12H11N3O6S2.
Ndizoletsedwa kugwiritsidwa ntchito m'makampani azakudya ku Europe ndi United States, malinga ndi zotsatira za maphunziro a toxicological omwe awonetsa kuvulaza kwake kwa anthu.
Zinthuzi zikuphatikizidwa pamndandanda wazowonjezera zakudya zomwe siziloledwa kugwiritsidwa ntchito m'makampani azakudya m'dziko lathu.