Palladium is also used as a barrier coat in the nickel-free process. The rack is dipped into a plating bath, electric current is activated, and plating occurs. Satin-relieving leaves fine lines and produces a dull, antique look. However, silver tarnishes and needs a protective coating. The plated finish or clearcoat is evaluated for adhesion loss, cracks or fractures due to stressed deposit.
Thermal shock can cause certain stones to crack during the plating process.