Barium Oxalate is a derivative of Oxalic Acid. Barium Oxalate is practically insoluble in water and converts to the oxide when heated (calcined). Barium Oxalate is a White odourless powder. Barium Oxalate decomposes at the temperatures above 400oC. It should be stored in tightly closed containers in a Room Temperature. Barium Oxalate is used as a green pyrotechnic colorant in specialized pyrotechnic compositions contain Magnesium.