. The American annual of photography. afe lightfor Panchromatic plates, and the Watkins Thermo Pyro De-veloper, with a dilution of i part A and i part B with 6 partsof water, we have a factor of 5. Now, it is possible to see theimage, leaving out the sky lines, as soon as it appears if onewill only wait a little after entering the dark room. Owingto what is known as the Purkinje phenomenon, the green lightof the safe light while not strong enough to fog the pan-chromatic emulsion is more easily perceived by the eye than ared one of equal strength— the green light is safe becauseit is so we
. The American annual of photography. afe lightfor Panchromatic plates, and the Watkins Thermo Pyro De-veloper, with a dilution of i part A and i part B with 6 partsof water, we have a factor of 5. Now, it is possible to see theimage, leaving out the sky lines, as soon as it appears if onewill only wait a little after entering the dark room. Owingto what is known as the Purkinje phenomenon, the green lightof the safe light while not strong enough to fog the pan-chromatic emulsion is more easily perceived by the eye than ared one of equal strength— the green light is safe becauseit is so weak—but the eye can see with it. A red one whichwas weak enough to be safe could only be seen by the eye withsome difficulty. Taking then, some prominent part of the image as a guidewe develop factorially, giving five times the appearance plate is then reversed in the bichromate reverser, exposedto strong light, washed about thirty seconds, and dried. Afterdrying, it is re-developed in the same developer that was used 138.
Size: 1315px × 1900px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorktennantandw
