A System of Instruction in the Practical Use of the Blowpipe
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Salt. -- (7) with carb. Soda. Fuses to a clear bead, which becomes crystalline on cooling. (8) Special reactions. Gives the boracic-acid-reaction. * * * * * Mineral. Cryolite Formula. 3NaFl+Al^{2}Fl^{3}. Behavior (1) in glass-bulb. Decrepitates slightly and gives a trace of water. (2) in open tube. If heated so that the flame be allowed to play up the tube upon the mineral, flourine is evolved, which corrodes the interior of the tube. (3) on charcoal. Fuses to a limpid bead, whi...ch on cooling becomes a white enamel. If heated for some time, it bubbles, gives off fluorine and becomes infusible. (4) in forceps. Fuses, coloring the flame yellow. (5) in borax. Dissolves to a clear bead, which is rendered opaque by a large addition. (6) in mic. Salt. As in borax. (7) with carb. Soda. Fuses to a clear bead, then spreads out on the charcoal, the soda is absorbed, and an infusible mass of alumina remains.
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