Lincoln cent question

I saw an ad in the current Coin World offering all 20 different Lincolns. Eight copper plated, 8- 95% copper and 4 proofs. If some of these 95% coppers end up in circulation, how is the best way to identify them?
DEPARTMENT OF REDUNDANCY DEPARTMENT
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Comments
....2.5 grams for zinc and 3.11 grams for copper. i think.
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<< <i>Drop them in salt water overnight
....or in the hand.