Dictionary of Arts, Manufactures, and Mines, Vol. 2 of 2: Containing a Clear Exposition of Their Principles and Practice (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Dictionary of Arts, Manufactures, and Mines, Vol. 2 of 2: Containing a Clear Exposition of Their Principles and Practice

According to Franke, the constituents of stick-lac are, resin, 65-7; substance of the lac, 28-3 coloring matter, 0-6.

Sced-lac. - When the resinous concretion is taken off the twigs, coarsely pounded, and triturated with water in a mortar, the greater part of the coloring matter is dissolved, and the granular portion which remains, being dried in the sun, constitutes seed-lac. It con tains of course less coloring matter than the stick-lac, and is much less soluble. John found in 100 parts of it, resin, 66-7; wax, 1-7; matter of the lac, 16-7; bitter balsamic matter, 2-5; coloring matter, 3-9; dun yellow extract, 0-4; envelopes of insects, 2-1; laceie acid, 0-0; salts of potash and lime, 1-0; earths, 6-6; loss, 4-2.

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