... 38-0 EINECS No.: 215-269-1 Purity: 99.8% 1 Black powder, soluble in dilute acid, ammonium ... other black RB promoting agents, reduction of desulfurizer, oil painting, used in making artificial anti-creasing silk industry and ... optical glass polishing agent, organic synthesis catalyst, the oil of desulfurizer, hydrogenated agent.6 Also can be used ... . Sell good quality Copper Oxide 99.8% from plant