Yasutomo Sumi Ink Stick .9oz Black. Soot from pine or certain vegetable oils mixed with animal or fish glue is molded and dried to form a well-shaped solid block which, when ground on a Suzuri stone with water, turns to ink. It is unsurpassed for producing the famous that form the basis of “monochromatic” Sumi painting. The subtlety of Sumi ink is evident in the variety of tones and values it produces.

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