In Stock Berkem products Extra patina Berkem Silverblack 200 1 liter Berkem 006640 €28.12 SILVERBLACK 200 is a chemical used to obtain, through accelerated oxidation, two-tone effects with an antique look on silver pieces. The shade that can be obtained can be blue or black depending on the treatment time. Extra quality: longer duration of the product once the container is opened. Add to cart