> >The problem is that light film rises to the top of the tray in
> >one-at-a-time tray wash and unless you poke it down every minute dries on
> >top. Even a cascade of water from a long pipe with holes has to be
> >re-aimed every minute or so. Most difficult is the N31P 30 by 40 cm --
> >does not stay under. I'm contemplating steps, but before going whole hog,
> >thought I'd ask....
> >
> >Judy
>
Judy, While small films (4X5) wash well in reels, larger sheets are
handled well in drum style tanks on roller bases, like the kind they
used to sell for color printing. The Jobo sheet film tanks work well also.
Carson is right in that washing films occurs very rapidly relative to
paper, and can be washed in a tray, one sheet at a time to avoid
scratching. I recommend to students that 6 or seven changes of water,
especially after a hypo clear, will wash the film. This has been
verified by testing. Complete changes of water are more important and
efficient than a constant running stream, and not wasting water is a plus.
John