when did they quit making pennies out of copper
Penny (United States coin) In 1943, at the peak of World War II, zinc-coated steel cents were made for a short time because of war demands for copper. A few copper cents from 1943 were produced from the 1942 planchets remaining in the bins. Similarly, some 1944 steel cents have been confirmed. From 1944 through 1946, salvaged ammunition shells made their way into the minting process, and it was not uncommon to see coins featuring streaks of brass or having a considerably darker finish than other issues.
Ten pence (British coin) The ten pence coin was originally minted from cupro-nickel (75% Cu, 25% Ni), but since 2012 it has been minted in nickel-plated steel due to the increasing price of metal. From January 2013 the Royal Mint began a programme to gradually remove the previous cupro-nickel coins from circulation with replacement by the nickel-plated steel versions.[3]