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most importantly on
棗, a practise started by Jōō; either on the bottom of the lid, or on the bottom of the
棗 secondly, on the tubes of
茶杓; sometimes written on the line between lid and tube.
thirdly, on
花入; usually of the maker instead of someone favouring it. Usually in lacquer, or some layer of bamboo is shaved of and the
花押 written in ink