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Printing Inks
Black printing inks
owe their color to finely divided carbon made from lampblack, pine-wood,
rosin oil, etc.,
according to the quality of the ink desired. The finest
inks are made from flamelamplack. There are however,
certain requirements
made of all printing inks alike, and these are as follows: the ink must be a
thick and
homogeneous liquid, it must contain no solid matter but finely
divided carbon, and every drop when examined
microscopically must appear as
a clear liquid containing black grains uniformly distributed.
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