This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...other easily volatilized metals being also partially removed, and the remaining button is treated with borax in 0. F., the resulting glass is colored usually with oxide of copper, p. 102. This cold glass treated in R. F. on a fresh coal, becomes red and quite opaque on cooling, but sometimes, if the B. F. is kept up ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...other easily volatilized metals being also partially removed, and the remaining button is treated with borax in 0. F., the resulting glass is colored usually with oxide of copper, p. 102. This cold glass treated in R. F. on a fresh coal, becomes red and quite opaque on cooling, but sometimes, if the B. F. is kept up too long, the copper is reduced and leaves the glass colorless. The reaction succeeds better when the glass is treated a few seconds beside some tin in K. F., p. 80; part of the tin oxidizes at the expense of the oxide of copper and dissolves without coloring the glass, while the resulting suboxide of copper makes the glass red and opaque. The lightness of the red color depends upon the freedom of the glass from other coloring oxides. S. Ph. may. be employed in place of borax. When thore is only a trace of copper, as in silver lead obtained on the large scale, or in lead reduced from cupreous litharge or abstrich, this method does not always afford a red bead, while in presence of antimony the cold glass is gray or black, and opaque. In such cases the alloy must first be fused in 0. F. alone on coal, until all the antimony is volatilized, then most of the lead must be dissolved in vitrified boracic acid, vide quantitative copper assay, p, 442, and the remaining globule treated some time with S. Ph. on coal in O. F., after which the glass bead is fused with tin in E. F. A trace of copper will render the cold bead distinctly red and wholly or partially opaque. When the alloy contains much nickel, cobalt, iron, and arsenic, most of the Co and Fe can be separated by borax on coal in R. P. and recognized by the color of the glass, p. 224, after which lead may be added, and this, with the remainder of the cobalt and iron, dissolved in boracic acid, wh...
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Add this copy of Plattner's Manual of Qualitative and Quantitative to cart. $84.20, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2015 by Arkose Press.
