Valuable Secrets concerning Arts and Trades:
or Approved Directions, from the best Artists, for the Various Methods...
Printed by Thomas Hubbard,
Norwich, 1795Chap. III. Secrets for the composition of Varnishes, &c.
XXXVII. To make sashes with cloth, which will be very transparent.
Take a fine white cloth; the finer you chuse it, the clearer and more transparent the sashes will be. Fix the cloth very tight on a frame. Then make some starch with flour of rice, and lay a coat of it, as smooth as you can, on your cloth, with a stiff brush of swine's hair. Lay that starch on both sides of the cloth, and, let it dry. When it is perfectly dry, pass, on both sides also, of the said cloth, thus prepared, the following varnish, with a soft brush of swine's hair likewise, having care to lay it on as equally and smoothly as possible, and let it dry afterwards.
XXXVIII. The composition of varnish fit for the above sashes.
Take of the finest and whitest wax you can find; six pounds; of the finest and clearest Venice turpentine, two; one and a half of the most perfect lintseed oil. Have a new and varnished pipkin, larger, at least by one third, than is requisite to contain all these ingredients. Put, first, in this pot the lintseed and turpentine oils together, and set it over a small charcoal-fire. When this begins to be a little warm put in the wax, cut in small bits, and take care to mix all well with a very clean wooden stick, till the wax, being thoroughly melted, is also well incorporated with the rest.
2. Now, take the pot off from the fire; and, while this composition is still a little warm, give a coat of it on both sides of the cloth, fixed on the frames, and prepared as before directed, and let it dry in the shade.
Note. You may render your sashes still more transparent, if, on both sides of them, you lay a smooth and equal coat of the following varnish, with a soft brush; then let it dry.
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