... Insoluble in water, micro-display gender, dissolved in acid, ammonia and sodium cyanide, heated to 60-80 °C darken, high temperature ... and then broken down into a black copper oxide and water. Reagents for analysis, but ... can be used as catalyst, mordant, pigment, feed additives,and colorings.Testing ItemTesting StandardAssay≥97%Assay(as Cu)≥63%Hydrochloric insolubles≤0 ...