Go back through the collection and there will be a lot of photographs that have a brown tone to them. Most are brown because the printer did not give the print an archival wash. Fix, or hypo, is the chemical used to harden the print emulsion. If the printer doesn't wash the print long enough, the hypo that remains behind leaches out of the print and turns a yellowish brown. An albumen print, a nineteenth century medium that used egg whites as a solution, mixed with the light sensitive salts and applied to the paper that was then used for printing had a natural rich brown tone. Sepia tone.
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