Process for Making Phase Holograms.
DEPARTMENT OF THE ARMY WASHINGTON DC
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A process for the production of a phase hologram of tanned gelatin in a gelatin matrix from silver halide photographic material is disclosed. The silver halide photographic material is exposed, developed with a non-tanning developer, bleached with a tanning bleach which removes the metallic silver of the metallic silver image areas while tanning the gelatin in the metallic silver image areas, and is fixed with a non-tanning fixing agent to remove the silver halide from the photographic material. Author