Practical Text book of Lithography a Modern Treatise On the Art of Printing Fr
Practical Text book of Lithography a Modern Treatise On the Art of Printing Fr
Warren Crittenden Browne
The book Practical Text book of Lithography a Modern Treatise On the Art of Printing Fr was written by author Warren Crittenden Browne Here you can read free online of Practical Text book of Lithography a Modern Treatise On the Art of Printing Fr book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Practical Text book of Lithography a Modern Treatise On the Art of Printing Fr a good or bad book?
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This paper is treated precisely as the other, so far as exposure and inking are concerned, but it must be floated inky side upward on nearly boiling water. Lichtdruk or Albertype. The inventor of this process, Herr Albert, substituted glass as the basis for the gela- 168 Practical Text Book tine because it gave him the opportunity of hardening the film from the back by exposure to light. By a prelimi- nary coating of bichromatized albumen, also hardened by exposure from the back, he was enabled... to effect his pur- pose more completely, so that a large number of impres- sions could be produced of very great beauty, and hardly distinguishable at a little distance from silver prints from the same negative. The Heliotype. In this process the film of gelatine is made portable. A glass plate having the slightest possible film of wax upon it is leveled, and the mixture of gelatine and bichromate of potash, with a small quantity of chrome alum, is poured upon it to the thickness of cardboard. When this has dried hard the film can be removed from the glass and exposed under the negative in the same manner as a piece of paper.
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