TheKangxi Emperor lifts thehaijin prohibition on sea trade, allowing foreigners to enter Chinese ports in 1684[1]
The amount of copper in the alloys if cash coins was reduced from 70% to 60% all while the standard weight was lowered to 1qián again, while the central government's mints in Beijing started producing cash coins with a weight of 0.7qián.[2][better source needed]
Spence, Jonathan D. (2002),"The K'ang-hsi Reign", in Peterson, Willard J. (ed.),Cambridge History of China, Vol. 9, Part 1: The Ch'ing Dynasty to 1800, Cambridge: Cambridge University Press, pp. 120–182,ISBN0521243343.
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