Brighten old, dark pennies in seconds! No scrubbing necessary at all. The effect is achieved only where the mixture has been in contact with the coin, so ensure you cover the entire coin!
In a small container, place a small amount of table-salt (1 gram is plenty).
Add enough acetic acid (vinegar, white vinegar is most recommended) to moisten the salt into a paste.
Now simply apply the paste to the penny wherever you want it to brighten up. The effect is immediate and obvious.
Note: if you don't have any vinegar you can substitute it with tomato ketchup because it is also acidic. This works well for copper bottom pans too!
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