Relation between viscosity and temperatu
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Elsevier Science
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India Ink, of a deep black, which gives neutral tints for halfshades, is very rare. It may be made as follows : Rub thoroughly together 8 parts lampblack, 64 parts water, and 4 parts of finely pulverized indigo. Boil until most of the water is evaporated, then add 5 parts gum arabic, 2 parts glue, a