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plural inkstones
A stone mortar used for the grinding and containment of ink in the East Asian art and calligraphy tradition. quotations examples
He turns to the inkstone and picks up by the handles the two inkballs, rolling the leather facings together to freshen the ink. […] As the pressman returns the inkballs to the inkstone, the journeyman closes the frisket and tympan.
2000, Richard L. Saunders, Printing in Deseret