Characters: black powder, insoluble in water and alcohol. Application: Paint, pigment, ceramic glaze, glassware and cobalt catalyst etc.
Characters: green powder; insoluble in water and alkali liquor, soluble in acid and ammonia water. Application: adhesive agent and colorant of enamel , pigment of cerami...
Characters: yellow powder; soluble in acid, insoluble in water. Application: spectral analysis reagent, high purity analytical reagent, varistor, thermistor, zinc oxide ...
Characters: white powder, insoluble in water and acid,soluble in the molten potassium hydrogen sulfate and hydrofluoric acid. Application: raw material of tantalum, as t...
Characters: white powder. Turn to yellow when heated, insoluble in water. Application: raw material of niobium, also used in optical glass and electronics industry.
Characters: white powder. Application: used in the production of metal germanium, also used for spectral analysis and semiconductor materials.