When people find coins, they do one of two things: place them in their collection or get the value of the coin and attempt to sell it to other collectors. Usually, getting the value of a coin is complicated. You have to factor in the year of the coin, how many scratches it has, if there are any errors (and if those errors happen to be rare), and any mint marks on the coin. When it comes to older coins, it gets even more complicated because bullion values, demand, rarity, and various design values start coming into play.
Keeping coins safe and in good condition is just as important as finding and/or buying them in the first place. Most of the time, coins aren't just a straight piece of a metal. They are nearly always a combination of multiple metals (the amount of metals like gold and silver can affect the overall value of the coin) and are composed a way that might be hard to maintain. For example, pennies aren't straight pieces of copper, nor are they straight pieces of a combination. Pennies starting from 1982 are actually a zinc core with a covering of copper. Meaning, if mix an acid that only corrodes zinc, you will be left with a shell of copper. This change was made because of the varying prices of zinc and copper.
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