METGUARD 21- Multipurpose Protector Description It is a multipurpose electrolytic passivating bath for Silver, Tin, Brass, Copper & Nickel which deposits a transparent, colorless inorganic protective coating on silver and silver & tin electroplate. Characteristics: Replacement of Carcinogenic Hexavalent Chrome (Silchrome) process RoHS/Reach compliance Protects against atmosphere containing Hydrogen sulfide and prevents the darkening of the metal No appreciable effect on the solderability and electrical conductivity of Silver and Tin. No effect of heat treatment > 150 deg. cent. Growel Advantage: Multipurpose Protector for Silver, Tin, Nickel, Copper, and copper alloy get a quote