I'm familiar with this; but by the 1840s-1850s, China was sending out more silver for opium than they were taking in for tea. That's the period I refer to when

I'm familiar with this; but by the 1840s-1850s, China was sending out more silver for opium than they were taking in for tea. That's the period I refer to when I'm talking about the opium trade as a wealth pump.