Pronice silver black produces anthracite-coloured oxide layers on silver surfaces. The colouring is chemically stable and inert. Since pronice silver black does not contain any free sulphur, there are no undesirable darkening or yellowing effects....
pronice ultra black is a blackening/oxidizing agent for silver which results in a deep black colouration. In combination with pronice silver black, it produces deep black oxide layers on silver surfaces. The colouring is chemically stable and...
