The US never made silver cents.
In Britain, special silver pennies are minted for "Maundy money" sets but these aren't intended to be spent. All British Pennies minted prior to 1796 were made from silver.
If you're referring to US cents, there's more information at the Related Question.
Op may be referring to silver colored steel cent minted during WWII.
U.S. cents have never had silver in them.
No. The U.S. has never made a silver penny.
No, there is no silver in a 1817 US penny.
US pennies have never been made of silver.
The US never made any silver 1 cent coins.
There is no such thing as a U.S. silver penny.
Sorry, the US never struck any silver 1 cent coins of any date.
The U.S. has never made a silver one cent coin of any type.
The U.S. Mint has never made a Silver Penny . If it is a 1957 Lincoln cent, it has likely been chrome plated which can look like silver. This is very common but the coin does not have any numismatic value.
Alchemy is the only way to turn a penny into silver. But post-1982 cents are zinc coated with a thin layer of copper and it is possible to remove it chemically which gives a silvery appearance. However, such a penny is NOT silver, is NOT worth any more than 1 cent.
No US 1976 Lincoln cent or any other year is made from silver.
There was never a silver Indian Head penny.