Results 1 to 7 of 7

Thread: Effect of developer dilution

  1. #1

    Join Date
    May 2005
    Location
    Olympia, Washington
    Posts
    258

    Effect of developer dilution

    I'm switching to Xtol (from TMAX-RS). I've one last decision to make: full strength or 1:1. I'm trying to understand the effect(s) of the dilution of developers. Let's say the reason you are diluting a developer is NOT to get a long enough development time to solve agitation problems. And the reason isn't simply to conserve developer. Can someone explain how a diluted developer affects image quality compared to stock solution (all other variables remaining constant except for time)? Thanks.

  2. #2
    C. D. Keth's Avatar
    Join Date
    Apr 2006
    Location
    Salt Lake City, UT
    Posts
    1,841

    Re: Effect of developer dilution

    I ahve heard that sometimes dilution can affect contrast in subtle ways, but I don't know if it's all developers or which way contrast is affected.

  3. #3

    Join Date
    Feb 2005
    Posts
    2,952

    Re: Effect of developer dilution

    This is from The film Developing Cookbook, by Anchell and Troop:

    "At a moderate dilution of 1:1 sharpness is increased while effective film speed is maintained. Graininess is slightly increased on dilution ... but the increase is small ..."

    They also say that a high subject brightness range is handled better when a solvent developer is diluted.

    I use XTOL at 1:1 or 1:2.

  4. #4

    Join Date
    Mar 2005
    Location
    Baton Rouge, LA
    Posts
    2,420

    Re: Effect of developer dilution

    I use Xtol 1:3 in Jobo Expert drum. I get a very good tonal range, and the grain is very fine, as long as the film is not over exposed. Since I am usually using 75 degree water, 1:3 is also necessary to keep the developing times reasonable.

  5. #5
    Resident Heretic Bruce Watson's Avatar
    Join Date
    Sep 2003
    Location
    USA, North Carolina
    Posts
    3,156

    Re: Effect of developer dilution

    Quote Originally Posted by Ed Richards View Post
    I use Xtol 1:3 in Jobo Expert drum. I get a very good tonal range, and the grain is very fine, as long as the film is not over exposed. Since I am usually using 75 degree water, 1:3 is also necessary to keep the developing times reasonable.
    Like Ed, I'm using XTOL 1:3 in a Jobo 3010 drum. I'm doing it at 20C however.

    What happens when you increase dilution, in part, is that you dilute the solvent. This tends to makes the grain a little bigger with a small gain in apparent sharpness.

    The effect is quite subtle however. I doubt that you'll see it at all with enlargements less than about 12x. I actually talked to Silvia Zawadzki and Dick Dickerson (XTOL's "parents") about this and they said I wouldn't really begin to see the difference until 15x. And for a 5x4 negative, that's a 75 x 60 inch print. I don't know how to make a print that big, so it's really a moot point, eh?

    So... Like Ed, I do it for the extra control. The economy is a plus, as is the slight gain in real film speed.

    Bruce Watson

  6. #6

    Re: Effect of developer dilution

    Hello! Plus there is a minimum amount of developer required per area of film, regardless of how that developer is diluted. Best regards.

    Mike

  7. #7

    Join Date
    Mar 2005
    Location
    Baton Rouge, LA
    Posts
    2,420

    Re: Effect of developer dilution

    > Plus there is a minimum amount of developer required per area of film

    Right, but for the 6 sheet expert drum, the minimum amount is less than the minimum the drum needs, so you do save a little by diluting it. This might be more significant in tanks that take a bigger volume. I am assuming we are talking about using it as a one shot. If you want to reuse it, then working with more concentrated solutions makes sense.

Similar Threads

  1. Old Formulas: Paper
    By Paul Fitzgerald in forum Darkroom: Film, Processing & Printing
    Replies: 12
    Last Post: 20-Oct-2006, 00:48
  2. 510-Pyro dilution behavior
    By Jay DeFehr in forum Darkroom: Film, Processing & Printing
    Replies: 2
    Last Post: 29-Aug-2006, 01:34
  3. Old Formulas : Film
    By Paul Fitzgerald in forum Darkroom: Film, Processing & Printing
    Replies: 6
    Last Post: 19-Mar-2005, 21:31
  4. Developer shelf life
    By Neal Shields in forum Darkroom: Film, Processing & Printing
    Replies: 11
    Last Post: 22-Jul-2004, 09:43
  5. Dilute developer in Jobo drums
    By bob moulton in forum Digital Hardware
    Replies: 7
    Last Post: 13-Jan-2002, 10:21

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •