Depends on how new it is, anything not freshly minted is going to have developed some tarnish. There are testing machines but you can largely go by sound as silver has a distinctive ring to it when struck or dropped.
I worked in a store back in the 70s, and I loved that ring when someone would drop a silver coin among their other change on the counter. Even back then, I would swap it out of the cash register after the customer left.
Depends on how new it is, anything not freshly minted is going to have developed some tarnish. There are testing machines but you can largely go by sound as silver has a distinctive ring to it when struck or dropped.
I worked in a store back in the 70s, and I loved that ring when someone would drop a silver coin among their other change on the counter. Even back then, I would swap it out of the cash register after the customer left.