RXSOL new formulation for removal of copper stains has been developed, Copper reacts with oxygen from air of presence of moisture to form copper oxide which is greenish in color. Never USE common acidic materials to clean Copper, As after cleaning of STAIN from Acid it will turn into BLACK.
When copper surface is exposed to atmosphere, Initially, the copper darkens, and takes on a black appearance as the copper oxidises to cupric oxide CuO. Then the carbon dioxide in the air, dissolved in water to form carbonic acid, H2CO3, will attack the basic copper oxide to form hydrated copper carbonate resulting pastel green on copper items.
Procedure
The chemical cleaning of copper stained by a new developed product of RXSOL is Easy and Safe.
Note
Why Copper Materials turns to Greeninsh / Black Colour?
Copper reacts with oxygen from air of presence of moisture to form copper oxide which is greenish in color.
What is Copper Corrosion?
Copper corrosion is due to outdoor exposure, Can be controlled by coat with some sort of lacquer.