A Handbook of Chemical Technology
A Handbook of Chemical Technology
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In our eReader you can find the full English version of the book. Read A Handbook of Chemical Technology Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Handbook of Chemical Technology
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The spirit, usually methylated spirit, ought to be strong, about 92 per cent. The Digitized by Google 490 CHEMICAL TECHNOLOGY.
Boltttion of the resins is promoted by the addition of one-third of their wei^t of coarsely powdered glass for the purpose of preventing the resinous matter caking together, and being thus to some extent withdrawn from the solvent action of the alcohol. In order to render the coating remaining from the evaporation of the spirit less brittle, Venice turpentine is usually... added. Sandarac vamish is obtained by dissolving lo parts of sandarac and i of Venice turpentine in 30 of spirit. Shellac varnish, more durable than the former, is obtained by dissolving z part of shellac in 3 to 5 of spirits. French polish is a solution of shellae in a large quantity of spirits, and when this polish is to be applied to white wood, the varnish is bleached by filtration over animal charcoal. Copal varnish, far superior to the foregoing, is made by first melting the resin at as gentle a heat as possible 80 as to prevent the colouration of the substance, which is next pulverised, mixed with sand, treated with strong alcohol on a water bath; and filtered.
What to read after A Handbook of Chemical Technology?
You can find similar books in the "Read Also" column, or choose other free books by Johannes Rudolf Wagner to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The spirit, usually methylated spirit, ought to be strong, about 92 per cent. The Digitized by Google 490 CHEMICAL TECHNOLOGY.
Boltttion of the resins is promoted by the addition of one-third of their wei^t of coarsely powdered glass for the purpose of preventing the resinous matter caking together, and being thus to some extent withdrawn from the solvent action of the alcohol. In order to render the coating remaining from the evaporation of the spirit less brittle, Venice turpentine is usually... added. Sandarac vamish is obtained by dissolving lo parts of sandarac and i of Venice turpentine in 30 of spirit. Shellac varnish, more durable than the former, is obtained by dissolving z part of shellac in 3 to 5 of spirits. French polish is a solution of shellae in a large quantity of spirits, and when this polish is to be applied to white wood, the varnish is bleached by filtration over animal charcoal. Copal varnish, far superior to the foregoing, is made by first melting the resin at as gentle a heat as possible 80 as to prevent the colouration of the substance, which is next pulverised, mixed with sand, treated with strong alcohol on a water bath; and filtered.
What to read after A Handbook of Chemical Technology?
You can find similar books in the "Read Also" column, or choose other free books by Johannes Rudolf Wagner to read onlineMoreLess
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