 | Gill's scientific, technological and microscopic repository - 1827 - 448 pàgines
...the resin, might be very advantageously combned. Mode of bleaching Shell or Seed-Lac.—Dissolve,. in an iron kettle, one part of pearlash, in about eight parts of water, add one part of shell, or seed-lac, and heat the whole to ebullition. Wh<^n the lac is dissolved, cool the solution,... | |
 | Luke Herbert - 1828 - 394 pàgines
...processes, that of making the salt, and of bleaching the resin, might be very advantageously combined. Dissolve, in an iron kettle, one part of pearlash...about eight parts of water ; add one part of seed or shell lac, and heat the whole to ebullition. When the lac is dissolved, cool the solution, and impregnate... | |
 | Perry Fairfax Nursey - 1828 - 474 pàgines
...nothing to desire, excepting, perhaps, on the score of economy. Dr. Hare's method is as follows: — Dissolve, in an iron kettle, one part of pearlash in about eight parts of water ; add one part of shell or seed lac, and heat the whole to ebullition. When the lac is dissolved, cool tbe solution,... | |
 | 1832 - 636 pàgines
...advantageously combined. Method of bleaching shell, or teed lac. By R. VOL. XVIII. PART I. HARE, MD — Dissolve, in an iron kettle, one part of pearlash in about eight parts of water, add one part of shell, or seed lac, and heat the whole to ebullition. When the lac is dissolved, cool the solution,... | |
 | Daniel H. Whitney - 1835 - 614 pàgines
...brush. To stain paper purple. Use a tincture of logwood. 255. Hare's method of bleaching shell lax. Dissolve in an iron kettle one part of pearlash in about eight parts of water, add one part of shell or seed lac, and Iieat the whole to boiling. When the lac is dissolved, cool the solution and... | |
 | Luke Hebert - 1835 - 938 pàgines
...and of bleaching the resin, might be advantageously combined " Dissolve," (says Dr. Hare,) " in аи iron kettle, one part of pearl-ash in about eight parts of water ; add one part of seed or shell-lac, and heat the whole to ebullition ; when the lac is dissolved, cool the solution, and impregnate... | |
 | Luke Hebert - 1836 - 942 pàgines
...salt and of bleaching the resin, might be advantageously combined. " Dissolve," (says Dr. Hare,) " in an iron kettle, one part of pearl-ash in about eight parts of water ; add one part of seed or shell-lac, and heat the whole to ebullition ; when the lac is dissolved, cool the solution, and impregnate... | |
 | 458 pàgines
...usea instead of the shell-lac varnish alone, as a vehicle in painting. 65. White Shell-lac Varnish. Dissolve in an iron kettle one part of pearlash in about eight parts of water; add one part of shell-lac, and heat the whole to ebullijtion. When the lac is dissolved, cool the 'solution, and impregnate... | |
 | Sheridan Muspratt - 1853 - 376 pàgines
...it through fine blotting-paper. Dr. HARE proceeds as follows : — Dissolve in an iron kettle about one part of pearlash in about eight parts of water, add one part of shell or seed lac, and heat the whole to ebullition. When the lac is dissolved, cool the solution,... | |
 | Leroy J. Blinn - 1866 - 216 pàgines
...it through fine blotting-paper. Dr. Hare proceeds as follows: — Dissolve in an iron kettle about one part of pearlash in about eight parts of water, add one part of shell or seed lac, and hi'ai the whole to ebullition. When the lac U dissolved, cool the solution,... | |
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... and heat the whole to ebullition. When the lac is dissolved, cool the solution, and impregnate it with chlorine, till the lac is all precipitated. The precipitate is white, but its colour... 
