Practical guide to photographic & photo-mechanical printing (1887)
Burton, W. K. (William Kinnimond) · London, Marion and co. · leaf 277
PHOTO-MECHANICAL PRINTING PROCESSES 257 must be at least as carefully guarded from light as a sheet of sensitised-albumenised paper is. The chloride of calcium is used in small fragments, which should be dried just before they are required by heating them over a bright fire in an iron sand-pan or… … a shovel. The same chloride of calcium will serve an indefinite number of times if it be always dried before it is used. A thermometer should be used and the temperature should be raised to about 80° F. ; but should never, on any account, be allowed to exceed 85°. When the films are dry, they are…
Photography · Photomechanical processes
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
