It's that arista edu 100... 120 rerolled to a four exposure roll. I seldom shoot more than one or two shots so I usually cut a roll in half. You know save your papers and spool kinda thing.
I have some d76 on the way so I shouldn't be using dektol straight any more. I have found truthfully that the mix of the two seems to develop film grainlessly but cuts the time in half. If develops paper a little bit more constrasty it seems to me but adds fifty percent to the development time.
The time for straight dektol on film was 2 minutes at about eighty degrees. Normal agitation about three or four times during the development.
I think what the straight dektol did was make the negatives fuzzy looking almost like paper. It was a different kind of fuzzy but there seems to be less detail than in the dektol d78 mix soup. Just how it "feels" to me.