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In general, the heavier the weight of the copper, the heavier the weight. The uniform and thick wall is an important reason to the Ming and Qing Dynasties copper furnace identification method: the overall style of the Ming Dynasty copper furnace is vigorous, the late Ming and early Qing Dynasty are so, to the middle of Qing Dynasty style tend to be delicate in shape and decoration on lack of vigorous. See the patina, genuine patina moist, treasure gas inside, long time constant. Fake patina withered, some like paint, put more and more ugly.
The second is casting, casting quality genuine average, quite fine. Fine casting weipin casting does not mean, where good place, or rough casting. The genuine products have natural and uniform wear, especially in the foot. Look at the color of the surface of copper furnace, such as copper oxide furnace surface layer color black or black with green, it is the lead in the copper material is not too high, such as generating copper; copper furnace surface that is green rust, tin is too high, has been close to the bronze alloy; as a clean copper furnace on the surface of yellow rotten no, that is the dense oxide layer, zinc is too high, is a brass alloy. On the surface texture, such as rough, uneven oxidation, or to see the sand hole, cast brass or copper alloy casting rough
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