At PostalAnnex+ in Long Beach, we take professional US passport photos, accepted by passport processing agencies. Most stores accept walk-in's, so no appointment is needed, but call the phone number at the top of the screen for your passport photo needs.
This silver sulphide tarnish can be quite easily removed using polishes that contain abrasives to rub off the silver sulphide, but these have the disadvantage of also removing small amounts of silver. Handily, chemistry provides a method which sidesteps this problem.
Tarnish is a blackish layer that develops when silver comes into contact with naturally occurring sulfur compounds in the air. Many people assume that sterling silver should be cleaned and polished before selling. However, this isn't always the case. In some circumstances it's better not to clean the silver at all.