The Kangxi Emperor lifts the haijin 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 1 qián again, while the central government's mints in Beijing started producing cash coins with a weight of 0.7 qián. [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.
Shi, Zhihong (2006), "China's Overseas Trade Policy and Its Historical Results: 1522–1840", Intra-Asian Trade and the World Market, Studies in the Modern History of Asia, Abingdon: Routledge, pp. 4–23, ISBN9781134194087.
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