Suma Soak K7 is a light alkaline powder, suitable for presoaking cutlery and items made of silver. It contains a blend of scale inhibitors and alkali for removal of dried-on food from cutlery and silver items. Suma Soak K7 can also be used to detarnish silverware. The combination of aluminium foil or block, solution and silver articles starts an electrochemical process to remove the tarnish from the silver.