Brushes Used to Clean off Copper Oxidation
In addition to being used for archeology, brushes could be used to revert oxidized copper to a previous state. Using a brush on an oxidized copper block could bring it back one stage of oxidation. I like this idea because it adds a new use to brushes and allows copper blocks to be reused. If copper cannot be recycled, than every time you want it fresh you must mine more.
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