Does Tin Plating Oxidize?

The higher the humidity level experienced by the parts during storage, the faster the tin plating will oxidize. Growth of the intermetalic layer is a much slower process than surface oxidation, but unlike oxidation, it is not self limiting.

How do you remove oxidation from tin plating?

Cut a potato or citrus fruit, like a lemon or lime, in half. Dip the cut half in baking soda and use this to gently scrub away the rust on your tin. Use a slightly more abrasive scouring pad if the tarnish is difficult to remove and a soft pad isn't working.

Does tin discolor?

If your molds are coated with tin, there's a chance that the tin has merely discolored from heat, or that bits of food are stuck to the surface. ... “Tin will change color,” Hamann said. “It will become mottled, battleship gray, even black. But that's what tin does.