Silver was the currency of Mongolia, and in the Mongol period, coins of the Southern Sung Dynasty were already despised, compared with the currencies of the Chin Dynasty that had an external appearance of high-quality coins.
銀はモンゴルの通貨であり、蒙古時代には良貨の外形をもつ金国の通貨に対し南宋銭がすでに卑しまれていた。