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Handling
Never pour hot water directly into it, make sure there's some cold water
Burkus explains that it should be filled only to the bottom of the kan-tsuki, so that there will be as little rust as possible in the area above the kan-tsuki, which will bear the most weight.
Never touch with bare hands, since the oil will change the colour of the
釜.
When emptying, take one hishaku into the chakin darai, then empty, scour bottom, rinse bottom with water from the chakin darai, and place on the embers.