As for the honey locust seed paste (Gleditsia sinensis), croton oil (Croton tiglium), ginger and scurf, these are all surfactants that help the pigment to disperse on the surface of the substrate.
至於皁莢子膏、巴豆油、薑及頭垢，則是界面活性劑，可以使顏料在介質表面擴散。