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Started by Verify-12, May 20, 2018, 11:15:12 PM
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Quote from: Figleaf on May 21, 2018, 11:41:47 PMI don't doubt a word of what you are saying. I still think it's scandalous.A copper-zinc amalgam cannot possibly be called bronze. Doing so is lying, or as it is known today, "fake news". It is brass. Don't take my word for it, look it up in Wikipedia. I don't care what the marketeers call it. German silver does not contain silver. Nordic gold is not made with gold. Commercial bronze is not bronze.I think the real problem is that calling it bronze is sexier than calling it Cu88Zn12. It puts weight on the claim that it is a separate sub-type. For similar reasons, Chinese cash coins and French revolution coins were once catalogued as existing in copper or brass. Wrong. The amalgam was just uneven, causing colour differences. A distinction without a significant difference. How important is the colour difference? If you want to have an expensive laugh, send a TPG two cheap type 1970 10 won coins in the same package, one after having spent a month in olive oil, the other after a rubbing with an eraser. I bet they will call one bronze, the other brass.I am further scandalised that for $75 you don't even get a report of the analysis. I maintain that it is even doubtful they actually did the analysis. In addition, I find the price laughable. Spend some time finding a contact who has access to a spectral analysis machine. In the country where I live, they are used by universities, some museums, technical and archaeological research agencies, metal trading companies and dealers in second hand jewellery. Make sure the contact understands how to handle a coin and why you don't want it cleaned. If you don't abuse it, they may well do an analysis for free. Buy your contact a nice bottle of wine from time to time.Peter