Loss of the image can be due to excessive humidity, however the real enemy of paper is chemical residue left by the photographic fixer, a chemical answer cued to take away grain from films and prints during processing. In addition, contaminants in the water used for processing and washing could cause injury. If a print is not totally washed to remove all traces of fixer, the result will be discoloration and image loss. By the mid-1800s, scientists and photographers have been experimenting with new methods to take and process photos that had been more efficient. In 1851, Frederick Scoff Archer, an English sculptor, invented the wet-plate unfavorable.
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