A sheet of heavy metal made of copper. Copper sheet is a reddish brown shiny ductile metal, and the powder is light rose powder. The color becomes dark in the exposed air, and green basic carbonate is formed on the surface in the wet air, which is easily soluble in dilute nitric acid and hot concentrated sulfuric acid, soluble in hot concentrated hydrobromic acid, and slowly soluble in cold hydrochloric acid, dilute sulfuric acid and ammonia; It can react with acetic acid or other organic acids.