... fineness; white powder or paste, non-toxic, insoluble in water, soluble in fuming sulphuric acid, stable chemical property ;can absorb ... materials with high density and surface finish, therefore widely used in paints, printing ink, coatings, plastics, rubber, chips, ... ; white powder or paste, non-toxic, insoluble in water, soluble in fuming sulphuric acid, stable chemical property Range of application ...