Digital BW, The Print

Note that Sandy recommended a thickness of two tenths of a mm.  Regarding
longevity, carbon transfer printing, a very old means of making photographic
prints, consists of a layer of gelatin with suspended carbon particles on a
substrate.  There are prints made with this process that are well over 100
years old, and they're doing fine.  For info on carbon transfer printing,
see:
http://www.alternativephotography.com/wp/processes/carbon-carbro/the-carbon-transfer-process


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