Books › The Violin: A concise exposition of the general principles of construction.., 1871 › scan 158
Scan 158
The Violin: A concise exposition of the general principles of construction.., 1871
4 lines. Read by computer on 28 September 2026. No printed page number was found. See the scan on archive.org.
1is termed brown or black rosin, and whilst still fluid, if agitated with about one-eighth part of water, and dried, it forms the yellow rosin of the chemist. The bleaching of common rosin has been often attempted, but with unsuccessful results, but latterly the patented process of Hunt & Pochin has enabled the soap and varnish makers to obtain it of an almost transparent white.
3The following is a short description of the process. Ordinary rosin is placed in a suitable vessel, and then melted, and whilst fluid, steam, carbonic acid, or a mixture of carbonic acid and nitrogen, is passed through the mass, until nearly the whole has been distilled, when the rosin having been condensed in a receiver, surrounded by constantly flowing cold water, is afterwards dried, and will then be found adapted for the purposes required. Violinists' rosin of very good quality may be made from Venice turpentine. Otto's method is this—Put a quantity of Venice turpentine in a pipkin, add a little water to it, and boil for two or three hours over a slow fire. As it rises, pour in small quantities of cold water to keep it from overflowing, and allow a drop now and again to cool on a plate, when if it rubs clear between the fingers, without sticking, it is sufficiently boiled. When thus boiled, pour it into cold water, work it well with the hands, to press out the water, and break it into pieces when cold; expose to the sun and air until all the moisture is evaporated, and the rosin quite transparent. Many violinists adopt a method of purifying, and rendering the rosin more transparent, by boiling it in vinegar, and whilst
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