The fruit acid in the ketchup is sufficient to remove the grime from a coin. Although it will bring the coin up nice and shiny, it will also remove any value the coin might have.
Ketchup and a sauce pad.
the best way to clean copper or silver coins and jewelry is ashes
Washing a coin will take away from the value. Even if it is dirty, just leave it alone. if you clean it details will come off so dont clean coins you might think it would be good to have them shiny but its not
No. When cleaning the coin you cause it to lose its authenticity and value.
I would not think it could but why not use ammonia we have done in the last hundred or so years? You put your coins of all types in a jar or pie tin and pour straight ammonia into the containers. You may have to scrub some of them with a toothbrush but it works like a charm. Next, if you don't have ammonia ketchup will clean copper perfectly. It works on copper bottom pans, pennies, tubing and other copper things. You could also try Dr.Pepper, and lemon juice since they both have acid in it, so it will clean the coins. I tried it, and it works.
To whiten pennies, you can create a mixture of vinegar and salt and soak the pennies in it for a few minutes. You can also use lemon juice or tomato ketchup to clean and whiten pennies due to their acidity. Alternatively, a commercial brass cleaner can also be used to polish and whiten pennies effectively.
The vinegar and salt in the ketchup will remove most of the dark tarnish on a darkened or dirty copper penny (you can accomplish the same effect more quickly using just a small dish of vinegar and salt). However, the penny will "clean up" with a slightly beige-pink or rosy color, significantly not quite the color of a shiny new penny.
ketchup - the vinegar ( acetic acid ) in ketchup changes the copper oxide to copper acetate which is soluable in water.
Dawn Magic Eraser!
Acids are effective at cleaning copper coins because they can dissolve the oxide layer that forms on the surface of the coins, revealing the clean copper metal underneath. The acid reacts with the oxide layer, breaking it down and making it easier to remove. However, acids must be used carefully as they can also corrode the copper if left on for too long.
A mixture of vinegar and salt can be used to clean copper pennies. Simply soak the coins in the solution for a few minutes, then gently rub them with a soft cloth to remove any remaining dirt or grime. Avoid using abrasive materials or harsh chemicals as they can damage the coins.
If you refer to the scrap value of the copper, there is no copper in British "copper" coins these days.