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.
For info on FrameWorks, contact Pip Chodorov at <email suppressed>.