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One Thousand More Paint Questions Answered; An Entirely New Book, a Sequel to "739 Paint Questions Answered." a Reference Encyclopedia Answering ... and Paint Manufacturer in Their Daily Work
National Painters Magazine
Paperback. General Books LLC 2012-01-08.
ISBN 9781150750052
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Publisher description
This historic book may have numerous typos, missing text, images, or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1908. Not illustrated. Excerpt: ... Recently Tuscan reds have been introduced on the market, consisting of iron oxide and inert mineral, sometimes carbonate of lime bases and alphanaptylamine coloring matter. These are liable to bleed like the para reds. Subject Tuscan reds to heat, side by side with standards and note effect. Test for richness of tone, fineness of grinding, and to determine comparative value test for tinting strength, but do not compare the alizarine toned red with one that is toned with a red of the para group. -- 45 -- Venetian Reds. Perhaps one of the most used pigments for exterior house painting and exterior painting in general is the so-called Venetian red. Very often red or burnt ocher passes under that name, but most of this pigment is manufactured from copperas in suitable furnaces where certain quantities of limestone or oyster shell lime is mixed with the copperas, the sulphur water from the latter imparting its sulphate to the lime, thus forming oxide of iron and sulphate of lime. The best Venetian reds contain, in the medium and dark shades, anywhere from 30 to 40 per cent. of sesquioxide of iron, while the very light or bright shades contain from 20 to 25 per cent. of iron, the balance being either hydrated sulphate of lime or sulphate of lime that has been dead burned in the furnace, making it incapable of absorbing water of cyrstallization again. These reds can be depended upon in all sorts of atmospheric conditions, while the reds that contain more than 5 per cent. of calcium carbonate are barred from use by railroad chemists on account of the action of sulphur gases on carbonate of lime and its liability to undergo a chemical change when attacked by such gases. There are many cheap and very inferior reds of the Venetian red order offered to the trade, a
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One Thousand More Paint Questions Answered; An Entirely New Book, a Sequel to "739 Paint Questions Answered." a Reference Encyclopedia Answering ... and Paint Manufacturer in Their Daily Work
Book reviews » One Thousand More Paint Questions Answered; An Entirely New Book, a Sequel to "739 Paint Questions Answered." a Reference Encyclopedia Answering ... and Paint Manufacturer in Their Daily Work
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