A silver object that is to be sold commercially is, in most countries, stamped with one or more silver hallmarks indicating the purity of the silver, the mark of the manufacturer or silversmith, and other markings to indicate date of manufacture and additional information about the piece.

How do you fix tarnished silver?

Clean Sterling Silver with Baking Soda Mix two parts baking soda to one part water to make a paste, then gently rub the mixture onto the jewelry. Let the paste dry completely to remove the tarnish. Rinse and dry with a soft cloth or microfiber towel. You can also follow a similar method using cornstarch.