... : Name ItemAppearanceApplicationHB-37Vandyck brown oily liquidUsed as an effective collector for the flotation of non-ferrous metal sulfide ... oxide;as well as foamingHB-39Yellow-brown liquidUsed as an effective collector for the flotation of copper,molybdenum ... 38 Collector Appearance:Yellow-brown liquid. Application:Used as an efficient collector for the flotation of copper,gold,silver,zinc, ...