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Scan 288
Old Violins And Their Makers, 1883
6 lines. Read by computer on 27 September 2026. Printed page 274. See the scan on archive.org.
1alcohol to be tested is placed. If the test be made with the areometer of Cartier, it should register 36deg., if with that of Baumé 39deg., and if with that of Gay Lussac 91deg.
3Gamboge is the resinous juice procured from a few specimens of Garcinia in Siam, Cochin China, and Camboja. It is sold in sticks, or rolls, or pipes, also in lumps or cakes. It is sometimes adulterated with starch, which may be detected by treating a little of the resin with boiling water, filtering the liquid, and adding a little of the alcoholic tincture of iodine, when, if starch is present, the liquid will become blue.
5Another, and, perhaps, a better sizing may be made in the following proportions: About 6½dr. of stick gamboge, 4½dr. of aloes (Socotrine) to ¾gill of alcohol of the same purity as that already named. Proceed in precisely the same manner as before, putting half of the resins in at a time. This latter sizing is to be preferred, because it will be more elastic, the aloes being mellower or softer than the gamboge. The colour obtained will also be a more decided yellow, a little greenish in regarding it at a certain angle of refraction, and it will weaken less the warmth of tint of the coloured varnish to be afterwards applied. It is, however, a matter of taste, as either of the above formulas will give a good sizing. Aloes is likewise sometimes adulterated in commerce, although it is not very dear. It is the thickened juice of the leaves of different kinds of aloe, and is imported under the names of Socotrine, East Indian or Hepatic, Barbadoes, Cape and Caballine aloes. The kind referred to above is what is called Socotrine, and when it is
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