There's no such loophole. The U.S. mint stopped producing silver coinage for circulation in 1965 (1969 for half dollars). The vast majority of such coins has long since been pulled from circulation. You can request rolls of dimes, quarters, and half dollars at any bank, but it's highly unlikely that you'd find any silver.
No, banks do not usually buy silver coins. However, you can always go to a silver and gold dealer and exchange your precious metals for hard cash there.
Some banks do sell American Silver Eagles, but they do not hold and sell silver coins that are turned in.
If you are talking about a US coin, you have to go to the US mint website to buy silver coins. Banks don't sell silver coins. They don't distribute them either.
You could take them to some banks and get silver dollars or other silver coins for them. There were also places that would give you $1 worth of silver bullion.
Generally not. Old circulated silver coins occasionally turn up, but banks don't make a point of keeping rare coins in stock.
No British circulating coin has contained any silver since 1946. From 1919/1920 to 1946, all British silver coins contained 50% silver. Prior to 1919/1920, all British silver coins were made from sterling silver or, 92.5% silver.
First build a time machine to travel back to the early 1960s. Then go to a bank with a silver certificate and ask the teller to exchange it for silver coinage. Silver certificates haven't been redeemable for silver coins since 1968.
Yes they are silver
You generally can't buy silver dollars or any older silver coins at a bank. Because the value of the coin greatly exceeds the face value of the coin, if someone wanted to deposit a silver dollar they would only give them $1 for it, when the coin is worth at least $30 in silver content. Because of this few people ever deposit silver coins and the ones that are deposited are bought by the bank employees as curiosities. The only "silver" dollars you might find at a bank are Eisenhower dollars, but these contain no silver and are sold for $1, but since many people keep them as curiosities, there are few banks that carry them in stock, but at some banks you might find a few. Some banks do sell silver proof sets and other collector coins, but the prices that they sell it for is much more than it would cost you to go to a coin shop and buy the exact same set for.
No British coin has contained any silver since 1946. From about 1919/1920 to 1946, all British silver coins were minted with 50% silver. Prior to 1919/1920, all British silver coins were made from sterling silver (92.5% silver).
Nothing is 100% PURE silver but like most silver coins it is 99.999% silver
There were proof sets made in 1974 and 1975 where all 8 of the coins were silver, and proof sets made during those years when none of them were silver. Assuming that your coins are in a set, check the 1 Cent coin - if it looks silver, then all the coins in the set are silver; if it looks bronze, then none of the coins in the set are silver.