Direct positive dry plate studies.  16, 24 and 32 minute exposures.

Direct positive dry plate studies.  16, 24 and 32 minute exposures.
Direct positive dry plate studies.  16, 24 and 32 minute exposures.
Direct positive dry plate studies.  16, 24 and 32 minute exposures.

Direct positive dry plate studies.  16, 24 and 32 minute exposures. -- source link
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#dry plate#glass plate#alternative process#silver gelatin
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