What restrictions were european visitors forced to observe in peking during emperor qian long time?

They were required to stay within certain locations APEX.

They were required to wear Chinese clothing.  Qianlong. The government operated huge textile factories, but some private firms were even larger. Hangzhou had a textile firm that gave work to four thousand weavers, twenty thousand spinners, and ten thousand dyers and finishers. The porcelain kilns at Jingdezhen employed the division of labor on a large scale and were able to supply porcelain to much of the world. The growth of the economy benefited the Qing state, and the treasury became so full that the Qianlong emperor was able to cancel taxes on several occasions. When he abdicated in 1796, his treasury had 400 million silver dollars in it.

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