The region of Xinjiang was conquered by the Qing dynasty after the Dzungar–Qing Wars ended with the territory of the Dzungar Khanate coming under Manchu administration by 1759, the Muslim leaders and the armies of the conquered territories fled to Badakhshan. On 28 July 1759 the leader of Badakhshan formally recognised Manchu rule. Under Qing rule, Xinjiang was administered as 3 circuits, the southern circuit being the former Dzungar Khanate paid with pūl coins. Zhao Hui, General of Ili requested to the Qianlong Emperor permission to take pūl coins from the locals and use the copper to cast Qing Chinese cash coins, Zhao Hui ensured that these cash coins would weigh the same as the old pūl coins and would preserve the previous Dzungar monetary system. General Zhao Hui set the exchange rate between pūls and Qing cash coins at 2 Dzungar pūls for 1 cash, further Xinjiang cash coins being the same weight as Dzungar pūl coins weighed 2 "qián" (7.46 g) as opposed to the 1.2 "qián" (4.476 g) circulating in contemporary China proper. As pūl coins were nearly made of pure copper the new cash coins created from them would become red in colour earning them the nickname of "Red Cash". As it was beyond the skills of the primitive Chinese metallurgists to remove the non-copper from the coinage 98% of the content of "Red Cash" was copper with the rest often being either zinc or lead as the Qing didn't have the expertise yet to remove this, the rest metal often came from scrap metal collected to cast cash coins.