Miao Yin: Miao Yin is made of copper and silver, which are second only to silver. This is handmade. The style is exaggerated, bold, revealing personality, rough, and does not care about details. The surface is "deliberately oxidized" and the appearance lacks brightness. It pursues an "ancient", "old" and "ancient silver" effect and is deeply loved by everyone. Miao Yin is mainly produced in Qiandongnan Prefecture, Guizhou Province, and is mainly hand-made by families, accounting for more than 70% of domestic Miao Yin. Miao Yin, Yunnan uses red copper, which is mainly made of factory molds, and there are also a few Miao Yin products of brass. The difference of seedling silver quality depends on the thickness of silver plating. Of course, the old silver is ~ 925 silver: it refers to silver containing 92.5% silver.