Both cuprous and cupric oxides are known. An amorphous explosive precipitate forms with ammoniacal cuprous chloride. Treatments with ammonium chloride (sal ammoniac), cuprous chloride/hydrochloric acid, and ammonium sulfate are somewhat successful. Copper(I) oxide or cuprous oxide is the inorganic compound with the formula CuO. Aqueous cuprous chloride solutions react with base to give the same material. Bronze disease is the chloride corrosion of cuprous (copper based) artefacts. It is also known as cuprous iodide. In some cases cuprous cyanide is used instead of sodium cyanide. The only oxides possibilities to consider for delafossite are cuprous copper and ferrous iron. This is due to a cuprous sulfite chromophore. Before the development of silicon power rectifier diodes, cuprous oxide and later selenium was used. Little evidence exists for cuprous hydroxide, which is expected to rapidly undergo dehydration. After this, the solution is introduced to a mixture of cuprous cyanide and toluene. The nickel-rich, cuprous, and disseminated ores, however, are not greatly dissimilar in their PGM content. The arylation of alkylthiolates proceeds by the intermediacy of cuprous thiolates.