Is it okay to combine copper with aluminum in case of minting or coin making? Thanks :)
Well, there are aluminum alloys that have copper in them (although they usually have other metals also), so I don't think it would be a problem. If you're thinking of copper plated aluminum, there is the potential for a galvanic reaction (meaning like a battery cell) that could cause the coin to corrode and fall apart. It's the same problem with the current production of US cents (which are copper coated zinc).
