Books › Old Violins And Their Makers, 1883 › scan 302
Scan 302
Old Violins And Their Makers, 1883
2 lines. Read by computer on 27 September 2026. Printed page 288. See the scan on archive.org.
1you can make by placing the flask in a common meat tin with water, but not so much as would rise above the level of the solution, taking care also, by the means already indicated, that the flask does not touch the bottom or sides of the tin. You need not, in this case, heat the water to boiling point. When the quantity is reduced to one-half of its original bulk, but not less, withdraw the flask and let the liquid cool. This extract is made for the purpose of ensuring that the alcoholic solution and the essential oil with which you are about to mix it will be the least possible time together. When the extract is cool, pour into it one and three-quarter gills of oxidised essential oil of turpentine, and shake the flask a little, so as to mix the two liquids. Replace the flask in the water bath, and apply the flame to evaporate the alcohol, which operation will be completed when you no longer observe bubbles on the surface of the liquid. When cool, you ought to have rather over two gills of coloured essence. After the alcohol is completely evaporated there will still be left a little water, because the former was not absolute to begin with. Continue, therefore, the evaporating process a few moments longer in order to eliminate it, because the liquid otherwise would not be so transparent, and the varnish to be made from it would be less siccative. If it still appear turbid, replace it in the water bath and continue the evaporation, but not too long, for it would then be the turn of the essential oil to go—tardily, of course—but still sufficiently to cause loss—for the proportion of essence being unable to contain more than that of colour given, the latter would precipitate to the bottom, according as the oil dimi-
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