Though the production of Cathayan black powder is a closely guarded secret, they freely share their stockpiles with mercenary units and their allies when marching to war.
BackSource: Warhammer: The Old World Online Rules Index
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The first time any unit in a Jade Fleet army that is armed with a handgun, a pistol, a brace of pistols, a repeater handgun, or a repeater pistol shoots, the range of that weapon is increased by 3".