Development of Konica 750

[HypoBob <hypobob@xxxxxxxxxxx>]

I have noticed that my Konica 750 contacts do not produce a good, crisp
white in the labels and frame numbers along the film rebate when the
contacts are printed for minimum time to produce maximum black.  On the
film, the frame numbers are a middle gray.  This has been true for me
with both Rodinal and Xtol development, and I thought it was just a
property of Konica 750 film.

Then on a recent roll I increased development time because I had a hunch
that the subject would produce low contrast, even in IR; and for this
roll the film labeling is nearly white in the 'properly printed'
contacts.

Since the usual benchmarks for zone system exposure and development are
not available for B&W IR photography, I'm thinking that the film rebate
may be a good indicator for development.

Have the rest of you Konica 750 users been getting good, dense, black
frame numbers on the negatives?

I typically develop Konica 750 for 7.5 minutes in Xtol 1+1 at 68 degrees
with agitation for 5 seconds every 30 seconds.  Increasing this only 30
seconds made a noticeable difference in the frame numbers.

Bob

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