Kai tsaye rawaya Rkuma ana kiranta ciyawa kai tsaye yellow darawaya kai tsaye 2G.Siffar ita ce foda uniform ɗin launin ruwan kasa, wanda ja ne da rawaya lokacin da aka narkar da shi cikin ruwa, ɗan narkewa a cikin fibrinolysin kuma ba zai iya narkewa a cikin sauran kaushi na halitta.Yana da duhu ja a cikin sulfuric acid kuma ya juya zuwa duhu rawaya bayan dilution (wani lokaci yana haifar da hazo mai launin ruwan kasa);Wani sashi wanda aka narkar da shi a cikin nitric acid yana juya launin rawaya mai haske zuwa launin zaitun, kuma an narkar da wani bangare a cikin sinadarin hydrochloric acid yana juya baki.Rawaya Kai tsaye RMaganin ruwa mai ruwa shine rawaya zaitun tare da maida hankali hydrochloric acid da orange orange tare da maida hankali sodium hydroxide.Hasken launi kore ne lokacin saduwa da ions jan ƙarfe, ɗan rawaya mai duhu lokacin haɗuwa da ions baƙin ƙarfe, da rawaya mai haske da orange lokacin saduwa da ions zinc da ammonium.