 Like the preceding Yongzheng Tongbao coinage all Qianlong Tongbao cash coins exclusively use Manchu mint marks characterised by the character "" (Boo) on the left side and the name of the issuing mint in the Manchu language on the right.A special characteristic of some Qianlong Tongbao cash coins is that the Chinese character "Long" (隆) at the bottom is sometimes written with a "Fou" (缶) instead of the usual "Sheng" (生).The Qianlong era saw the founding of the Zhili mint in the city of Baoding (保定) as well as several mints in the newly conquered region of Xinjiang, some of these mints oversaw the production of "red cash coins" (紅錢) which were made of nearly pure copper.