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" The iron is oxidized at the expense of the phosphoric acid, causing the formation of a borate of the oxide of iron, which fuses at a sufficiently high temperature. The bead is then taken from the... "
A Manual of Blow-pipe Analysis: And Determinative Mineralogy - Page 55
by William Elderhorst - 1867 - 159 pages
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Manual of Practical Assaying: Intended for the Use of Metallurgists ...

John Mitchell (F.C.S.) - Assaying - 1846 - 448 pages
...charcoal, enveloped in a piece of paper, and struck lightly with a hammer, by which means the phosphuret of iron is separated from the surrounding flux. It...magnet, frangible on the anvil, the fracture having the colour of iron. If the substance under assay contained no phosphoric acid, the iron wire will keep...
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Manual of Practical Assaying: Intended for the Use of Metallurgists ...

John Mitchell (F.C.S.) - Assaying - 1846 - 450 pages
...charcoal, enveloped in a piece of paper, and struck lightly with a hammer, by which means the phosphuret of iron is separated from the surrounding flux. It...magnet, frangible on the anvil, the fracture having the colour of iron. If the substance under assay contained no phosphoric acid, the iron wire will keep...
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Manual of Practical Assaying: Intended for the Use of Metallurgists ...

John Mitchell (analytical chemist.) - Assaying - 1854 - 608 pages
...charcoal, enveloped in a piece of paper, and struck lightly with a hammer, by which means the phosphuret of iron is separated from the surrounding flux. It...magnet, frangible on the anvil, the fracture having the colour of iron. If the substance under assay contained no phosphoric acid, the iron wire will keep...
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A Manual of Practical Assaying

John Mitchell (F.C.S.) - Assaying - 1868 - 840 pages
...charcoal, enveloped in a piece of paper, and struck lightly with a hammer, by which means the phosphuret of iron is separated from the surrounding flux. It...magnet, frangible on the anvil, the fracture having the colour of iron. If the substance under assay contained no phosphoric acid, the iron wire will keep...
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Elderhorst's Manual of Qualitative Blow-pipe Analysis: And Determinative ...

William Elderhorst - Blowpipe - 1873 - 314 pages
...iron is oxidized at the expense of the phosphoric acid, causing the formation of a borate of the oxide of iron, which fuses at a sufficiently high temperature....metallic lustre, excepting at the ends, where it will be oxidized and burnt. The substance to be assayed ought not to contain sulphuric acid, arsenic acid,...
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Elderhorst's Manual of Qualitative Blow-pipe Analysis and Determinative ...

William Elderhorst - Blowpipe - 1874 - 340 pages
...iron is oxidized at the expense of the phosphoric acid, causing the formation of a borate of the oxide of iron, which fuses at a sufficiently high temperature....metallic lustre, excepting at the ends, where it will be oxidized and burnt. The substance to be assayed ought not to contain sulphuric acid, arsenic acid,...
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