Streaks from Diafine

Discussion in 'B&W: Film, Paper, Chemistry' started by rexp, Mar 31, 2005.

  1. rexp

    rexp Member

    Oct 29, 2004
    Lincoln, Neb
    Med. Format RF
    I tried some 120 format Tri-X in Diafine in a search for a low-light film/developer combination. Pretty much "by the book" as a starting point. Agitation is supposed to be "gentle" so's I did one easy inversion every minute. I ended up with some streaks. I have not printed any of the negs larger than 8x10, but things look pretty reasonable. Good tonal range and densities.

    I was wondering if diluting the two solutions and developing longer would help prevent streaks? Maybe someone has a different solution. I am open to suggestions.
  2. Donald Qualls

    Donald Qualls Member

    Jan 19, 2005
    North Caroli
    Multi Format
    Do not dilute the two solutions.

    Bath A will not keep if diluted -- mixed as directed, it has a virtually unlimited storage life and can be reused until the volume is too small to cover the film. Diluted, the preservative will be unable to prevent oxidation of the developing agents and the developer will go bad, possibly without warning. Diluting Bath B would slow down the process, but you would gain nothing relative to the streaking you describe. In addition, dilution (especially of Bath B) would be likely to increase grain, because both solutions contain lots of sodium sulfite that acts to control grain size.

    When I develop in Diafine, I give five inversions in 10-15 second on filling and at 1 and 2 minutes in Bath A, 2 inversions on filling and at 1 and 2 minutes in Bath B; I've never seen streaks. "Gentle" agitation is as opposed to the cocktail shaker agitation advised for some developers; especially in Bath B, one doesn't want to wash the residue of Bath A out of the emulsion too quickly.