 As a reminder to the people of Xinjiang that the Manchus conquered the region one in five cash coins produced in that region after the death of the Qianlong Emperor was ordered to bear the inscription "Qianlong Tongbao" (Emperor Qianlong Money), as a consequence cash coins with this inscription continued to be produced until the end of the dynasty.During the first few years of the reign of the Qianlong Emperor China had suffered from a shortage of cash coins due to the contemporary scarcity of copper, but soon Yunnan's copper mines started producing a large surplus of copper allowing the Qing government to swiftly increase the money supply and minting more coins at a faster pace.The cash coins produced during this early period are similar in size and quality as the preceding Kangxi Tongbao (康熙通寶) and Yongzheng Tongbao (雍正通寶) cash coins, but over time the quality and size of the Qianlong Tongbao would deteriorate.