Grodal Cu 860 Description Description - GRODAL CU 860 is a liquid material added to water to prevent tarnish and oxidation of copper surfaces after Electrolytic copper plating. Application - At higher concentration (e.g. 1%) can be used as a final on bare copper boards. The Growel Advantage: Prevent tarnishing and oxidation of copper surfaces after electro-less and electrolytic copper plating. Easy to dissolve in water It is completely invisible and has measurably superior corrosion resistance than uncoated copper. Does not contain chromates. get a quote