Gucheng Village is the core production area of ​​the sandstone. The enamel sand machine has a history of more than two thousand years of firing, and is the same as “Yixing Zisha”. In 2008, the handicrafts of black sand was included in the national intangible cultural heritage. Known as the “Clam Casserole”, the 荥 荥 sander is made of a clay and coal ash that is abundant in the local area and fired at a temperature of more than 1000 degrees. These sanders are simple in texture, anti-corrosion, acid and alkali resistant, can not afford chemical reactions, store foods are not easy to deteriorate, can maintain food nutrients and taste delicious, so it is widely praised.