Expand of craft-the relationship between art casting and surface treatment

对铜合金铸件的表面着色进行了检测，并在此基础上制作了130多个颜色样品。我们通过比较各种铸造工艺、合金类型、精加工方法和化学处理的差异来寻求稳定的颜色。大量的着色剂被开发出来，发现能够增加黄铜化学处理着色剂的范围是一项重大成就。

Coloration to the surface of copper alloy casting was examined, and based on the coloration, more than 130 color samples were made. We sought steady coloration by comparing the differences of various casting process, types of alloy, finishing methods and chemical treatments. A significant number of colorations were developed, and finding the ability to increase the range of chemical treatment colorations for brass was a big achievement.