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the best way to clean copper or silver coins and jewelry is ashes
Allowing that you clean the metal correctly and use the correct primer.
Different types of metal require different types of cleaners. Copper can be cleaned with salt and lemon. Silver can be cleaned with solutions made specifically for silver, which can be bought at the grocery store.
Copper oxides are soluble in acids.
There are several ways. You can get a silver cleaning cloth or a liquid silver cleaner where you dip the silver into and then wipe it clean.
It really isn't possible to say. Silver, when first minted is silver coloured, but after many years and depending on how it is stored it can be nearly any colour of the rainbow. If your coin isn't white silver do not clean it you will only ruin the value of it. Collectors like toned coins, if you clean your coins back to shiny white it will lose value without a doubt do not clean coins.
Mercury will form a thin film on a clean copper sheet, and in this form, is used to capture very fine or dissolved gold. And clean copper is very easy to solder.
So toothpaste might clean silver but who noez i dnt <SHLASH>
You can clean an antique copper faucet. However, you may not want to. If you clean the piece it could lose its patina which takes away from its value. If you do clean it, use soap and water and be gentle.
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.