 ... oxygen from the air, and forms a resinous mass. It unites readily with bromine, and is blackened by concentrated sulphuric acid in the cold. II. Examination of the water extract, the Gum. — Gum is a normal constituent of lacquer juice, and forms...  Journal of the Chemical Society - Page 479by Chemical Society (Great Britain) - 1883Full view - About this book
 | Royal Society of Edinburgh - Science - 1886 - 1098 pages
...a normal constituent of lacquer juice, and forms from 3 to 8 per cent of the original liquid. Since gum is insoluble in alcohol, it is conveniently separated by treating that portion of the original which was insoluble in alcohol with boiling water, filtering, and evaporating on a water-bath till... | |
 | Royal Society of Edinburgh - Science - 1886 - 1120 pages
...normal constituent of lacquer juice, and forms from 3 to 8 per cent, of the original liquid. Since gum is insoluble in alcohol, it is conveniently separated by treating that portion of the original which was insoluble in alcohol with boiling water, filtering, and evaporating on a water-bath till... | |
 | John Rattray, Hugh Robert Mill - Edinburgh. International forestry exhibition, 1884 - 1885 - 654 pages
...normal constituent of lacquer juice, and forms from 3 to 8 per cent. of the original liquid. Since gum is insoluble in alcohol, it is conveniently separated by treating that portion of the original which was insoluble in alcohol with boiling water, filtering, and evaporating on a water-bath till... | |
 | Industrial arts - 1903 - 456 pages
...alcohol, but almost insoluble in water. Gum is another normal constituent of nrushi, and forms 3-8 per cent. of the original juice. As gum is insoluble...weight of the substance remains constant. In this way a 1'riable lightcoloured substance is obtained, tasteless and inodorous ; this is the anhydrous gum.... | |
 | Industrial arts - 1909 - 592 pages
...alcohol, but almost insoluble I in water. Gum is another normal constituent | of urushi, and forms 3-8 per cent. of the original juice. As gum is insoluble...tasteless and inodorous ; this is the anhydrous gum. A mixture of gum and urushic acid (and with water) in the proportion in which they exist in the juice,... | |
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