When automatically feeding transparencies or back print film, remove each
sheet after it is delivered. Do not allow film sheets to stack up in the paper
output tray.
Let the printed sheets of film dry completely before storing them. The
complete drying time required for Canon's transparencies or back print film is
approximately 15 minutes.
When a sheet of film has dried completely, cover its printed side with a sheet
of plain (not coated) paper before storing it; this is recommended even if you
place the sheets of film in a clear file.