For over a hundred years after a suppression of the 'flying money' there was no other medium of exchange, apart from commodities, but copper coins. Before proceeding further, I must refer to a curious medium of exchange known as "skin currency" which, however, rarely circulated beyond the few Court nobles.

Ma Tuan-lin states that in the reign of Wu-Ti of the Han dynasty, in the early part of the second century b.c., pieces of skin of white stag, measuring one square foot and embroidered on the hems, of a nominal value of 400,000 (units not specified), were issued among the Feudal Princes and Nobles of the Court, to represent values. This skin currency is known to have continued to exist for quite a long while - as late as 1200 a.d.