A description is given of micro-chemical analytical methods that can be used to identify corrosion products on copper and copper alloys. Both soluble and insoluble constituents can be identified by these methods. Constituents discussed in detail include oxides, chlorides, sulfates, sulfides, carbonates, silica, calcium, magnesium, sodium, ammonia and metal constituents of the material being examined. A method for spectrographic examination of corrosion products is considered briefly.