A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...
A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...
A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...
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166 THE METALLURGY OF ANTIMONY.<br />
powdered bismuth, 24 parts of powdered stibnite, and 64 parts of<br />
saltpetre is melted and is poured, while molten, into water. The<br />
mass thus obtained is brittle and is finely powdered, washed and<br />
dried, and is melted with 128 parts of litharge and 8 parts of sal<br />
ammoniac. This yellow pigment has almost fallen into disuse,<br />
because of its instability and the high price of bismuth.<br />
(8) The yellow pigment can also thus be obtained :—Melt together<br />
16 parts of litharge, 1 part of sal ammoniac, \ part of antimonate of<br />
bismuth (obtained by heating a mixture of 30 parts of bismuth, 240<br />
parts of antimony sulphide, and 640 parts of nitre), and, after<br />
complete.fusion, pour into water.<br />
(c) Antimony Yellow of a Permanent Character (Fr. jaunes fixes).—<br />
This can be obtained by employing antimonic acid, produced by treating<br />
the perchloride of antimony with water and the residue with<br />
hydrochloric acid. It can also be prepared by slowly calcining<br />
antimonate of protoxide of iron, obtained by double decomposition,<br />
in the air. The result thus obtained is very resistant to the action<br />
of sulphurous vapour. When chloride of antimony is treated with<br />
a current of sulphuric acid vapour, the resulting pigment is still<br />
more resistant to the action of sulphurous vapour. Sulphuric acid,<br />
which, as a rule, is very injurious to Naples yellow and blackens it,<br />
is in this case a good agent for vivifying the colour. Various hues<br />
of yellow pigment can be obtained by adding to it an oxysulphide<br />
formed by the action of sulphantimonate of sodium in a solution<br />
of sulphate of zinc. The precipitate is a very deep orange-yellow,<br />
very insoluble, and is dried at 50°. A mixture of this with the<br />
persulphide in various proportions will produce hues of colour from<br />
lemon-yellow to orange yellow.<br />
(e) Antimony Blue.—This pigment is, as yet, without an equal in<br />
the manufacture of artificial flowers. It is thus produced:—A dilute<br />
solution of potassium ferrocyanide is added to a clear solution of<br />
metallic antimony in aqua regia. According to Krauss, this is merely<br />
a Prussian blue obtained from the ferrocyanide used, which is decomposed<br />
by the strong acid, with evolution of hydrocyanic acid, the<br />
antimony thus possessing no colouring principle.<br />
(/) Antimony Violet.—This is obtained by mixing antimony vermilion<br />
and either antimony blue or other kinds of blue together.<br />
(g) Antimony Green.—This is obtained by the mixing of antimony<br />
yellow and antimony blue in different proportions.<br />
(A) Antimony Orange.—R. Wagner recommended the use of<br />
sulpho-antimonite of barium mixed with artificial sulphate of baryta<br />
[Mane fixe) as furnishing good pigments for painting.