Word for 8/15 – Copper

The word copper makes me think pennies.  US Lincoln Memorial pennies dated 1981 or earlier are  95% copper. Those dated 1983 or later are made of zinc.

If an US penny was made in 1982  it might be either, however copper pennies weigh 3.11 grams, whereas the zinc pennies weigh only 2.5 grams.

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