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sumi; India ink; Chinese ink; ink stick; ink-cake
squid ink; octopus ink
carpenter's inking string
習字には墨を使うのが基本だね。
Using ink is basic for calligraphy.
墨で絵を描くのは難しいけど楽しい。
Drawing with ink is hard but fun.
古い墨は香りがいいと言うよね。
They say old ink smells good.