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Is the dragon mirror made of bronze in the first month of the 22nd year of Hongwu?
Yes
The website of high school history shows that in the 22nd year of Hongwu in Ming Dynasty 1389, bronze mirrors were used in Ming Dynasty.
Bronze is the earliest alloy in the history of metal smelting and casting. Adding tin or lead alloy to pure copper (red copper) is of special importance and historical significance.
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