The zinc coating was stripped off the coin in an acid bath. The coin was then replated with zinc to enhance the appearance. They usually have a mirror finish with a bluish tint. Original steel seats will have a silver matte finish.
A long time ago there were companies that advertised in coin papers to "reprocess" steel cents. If I remember correctly, they did it on a percentage of the coins you sent and no money exchanged hands. Something like if you sent them 500 coins they'd reprocess them all and return you 250 finished coins. They kept the other 250 as their "fee" for doing the work.
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