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Mostly as I know, lemon juice or vinegar can be used to clean copper pennies. You can let soak in for a while to clean them. Good luck in cleaning them!
Vinegar will do it.
Vinegar and salt solution, the acetic acid from the vinegar dissolves the copper oxide. The copper from the copper oxide stays in the liquid
Vinegar contains Acetic acid that reacts with the copper in the penny.
Some of the more popular ways to clean a heavily tarnished copper saucepan include lemon and salt, ketchup, and salt, vinegar and lemon mixed. You could also use commercial copper cleaning products such as Tarnex.
I am not sure what you mean by "spirits of salt", but a mixture of vinegar and salt is a very effective copper cleaner.
I assume you want to clean copper coins? Steep the coins overnight in vinegar.
The best thing too use too clen your copper saucepan is jut hot water and baking soda. You can also use lemon halves dipped in salt,this is much beter than any commercial cleaners.
vinegar
CNN.com has an article about spring cleaning and they say to use a tablespoon of salt &1 cup of white vinegar added to boiling water to clean tarnished copper.
Sure. It is best if the copper is clean of grease or oil, first. Sometimes the baking soda is mixed with vinegar instead of water, but either way it is a good cleaner.
Pennies get dull over time because the copper in the pennies slowly reacts with air to form copper oxide. Pure copper metal is bright and shiny, but the oxide is dull and greenish. When you place the pennies in the vinegar solution, the acetic acid from the vinegar dissolves the copper oxide, leaving behind shiny clean pennies.