Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A finely divided, bulky, black soot, at one time the most important black pigment used in the manufacture of printing inks. It is produced by the imperfect combustion of pitch resin or tung oil, or fatty substances, such as naphthalene, in a vessel within a tent made of paper or sheepskin. The smoke is deposited on the inside of the tent which is then beaten to cause the soot to fall off. The soot is then heated several times to a very high temperature in a metal container having a small opening in the top, through which the impurities escape. See also:CARBONACEOUS INKS ; CHINESE INK . (156 , 235 )

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