If it is plated with chrome, it might show a slight magnetic attraction to a magnet. You can stand the coin on end and hold a magnet near by and see if it moves. (that would rule out mercury added to your coin) The attraction would be no where near a 1943 steel cent. Cents have been plated through the years. (copper, silver, bronze, gold to add color to make you think it is something else)
Copper is plated on to zinc coins and steel coins to cover the base color.
Silver color is added to make a coin look like it was the wrong planchet or the sell off by TV sources as something added.
Gold is also added to make the stock material look wrong also to sell off by TV sources as something added to the coin.
Bronze color is also noticed on zinc cents when there is an issue with color.
Some plating companies will plate cents to hand out to their customers to show the quality of plating.
The plating process involves using different colors to get the final project complete.
Once plated a coin is rendered undesirable by most collectors.