Wakilin kare kayan yadi shine reagent na sinadarai don kammala yadi. Saboda akwai iri da yawa, ana ba da shawarar zaɓar nau'in da ya dace gwargwadon buƙatun da maki na kammala sunadarai. A lokacin sarrafawa, ƙaramin wakili na ƙarewa mafi yawa shine mafita, yayin da babban wakilin karewar kwayoyin shine mafi yawan emulsion. Tare da wakili mai ƙarewa, mai shafawa na UV, wakilin haɓaka saurin launi da sauran mataimaka ana kuma buƙata yayin samarwa.
