From: Jim Carlile (email suppressed)
Date: Thu Apr 01 2010 - 19:28:56 PDT
This is from the Kodak site:
KODACHROME AND EKTACHROME Films,
Process E-6. When KODACHROME Film is processed as
black-and-white, the black rem-jet backing may not have
been removed. To remove the rem-jet backing, swab the film
with cotton dipped in a mild alkaline solution—a 5-percent
solution of sodium carbonate will do the job. Be sure to keep
this solution off the emulsion side of the film. Rinse the film
to remove the sodium carbonate.
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For info on FrameWorks, contact Pip Chodorov at <email suppressed>.