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Half-reactionsSince 1982 US cents have been made of zinc plated with a thin layer of copper. It took the Mint several years to stabilize the plating process to prevent reactions when the coins were exposed to air, dirt, skin oils, and such. Many early-date zinc cents exhibit black spotting and mottling because of those problems. Vinegar Reaction
  • Ideas suggests that the acetic acid in vinegar reacts with the copper oxide that has formed on older pennies, and the resulting byproduct is copper acetate. The copper acetate then dissolves in the vinegar solution, therefore getting rid of the black color-producing agents and making it a bit shinier, although it will not appear as shiny as it once was with just vinegar.

Vinegar and Salt Reaction
  • The vinegar in this solution does its job and removes the copper oxide, thus getting rid of the black color. If you place the pennies in the salt and vinegar solution, then take them out without rinsing them, the surface will turn greenish if given ample time to do so. This reaction may become apparent within a few hours or up to a week. Science Project Ideas calls this reaction verdigris; this name can reference many different copper compound reactions, including the one that the salt and vinegar mixture produces. Copper chloride is the name of the chemical reaction of mixing the copper and the sodium chloride from the salt. Copper acetate is the name for the reaction of the copper and acetic acid in vinegar. To prevent this copper reaction, just rinse the pennies after you take them out of the solution

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Related Questions

What were Victorian pennies called?

a penny black


What color does pennies turn when get cleaner?

shiny brown


If the green color of the copper coating that covers the statue of liberty is different from the color of a typical copper penny what caused the statue of liberty copper coating to turn green?

Acid in the rain reacted with the copper to turn it green. That is why there is sometimes green on pennies. Acid in the rain reacted with the copper to turn it green. That is why there is sometimes green on pennies. Acid in the rain reacted with the copper to turn it green. That is why there is sometimes green on pennies. Acid in the rain reacted with the copper to turn it green. That is why there is sometimes green on pennies.


Why does grape juice cleans pennies?

cuz ur black niggie


How can you turn black?

You are either born black or not, and you can't simply "turn" black at will.


Why does baking soda turn pennies blue?

Baking soda reacts with the copper surface of the pennies, causing them to form a blue/greenish copper oxide layer. This chemical reaction changes the surface of the pennies, giving them a blue appearance.


Why do bannans turn black?

because if they get old they turn black


Does gold turn black?

Not naturally it can't turn black.


Do peaches turn black?

Peaches have been known to turn black.


Where do you turn in your old pennies?

You can turn in your old pennies at various places, including banks, which often accept them for deposit or exchange. Coin-counting kiosks like Coinstar also allow you to convert pennies into cash, though they may charge a fee. Additionally, some retailers may accept them as payment. If you have a large quantity, consider donating them to charities that accept coins.


Can a shop turn away payment in pennies?

Actually it is their option to accept pennies. It just not very common. There are some countries that "advise" that the acceptance of pennies as payment may not exceed a certain amount after which they are not classed as "legal tender" one such country is the UK where up to 20 pence in pennies is the maximum that is classed as legal tender


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