... the bottom. Suitable Materials: 1.Inorganic compounds: boric acid, calcium carbonate, hydroxide, cupric hydroxide, all kinds ... cryolite and so on. 2.Organic compounds: fenatrol (insecticide of agrochemicals), cadmium laurate, benzoic acid, germicide, sodium oxalate, ... Dyestuff: anthraquinone, black ferric oxide, indigo pigment, butyric acid, titanium hydroxide, zinc sulfide, all kinds of intermediate ...