pyrocat and uneven development

Discussion in 'B&W: Film, Paper, Chemistry' started by marko_trebusak, Sep 9, 2004.

  1. marko_trebusak

    marko_trebusak Member

    Messages:
    90
    Joined:
    Aug 31, 2004
    Location:
    Slovenia
    Shooter:
    Multi Format
    My first test developing my own Fuji Acros in Pyrocat-HD (35 mm) is finished. Now good things:
    -everything went smooth
    -I didn't scratch the film
    -tonalities looks good (I have to take the film to be measured the densities)

    And now bad things:
    -some uneven development above zone VII, I think
    -lighter lines across emulsion

    My first development of B&W film after almost 20 years must be concluded to be successful. As for my problems: I think that my main failure was agitation. Tom Hushinson (thank you) suggested two gentle inversions every minute. I just turned tank upside down two times and put it back to water bath. I think that I should increase agitation in first minute of development (as per AA's "The Negative") and try a rotating action together with turning tank upside down. As for the lines: if I remember correctly, someone asked about them on this forum not so long ago, and was told that they are from air bubbles. I did my stuff during the night, because then my kids are (hopefully) sleeping, and because I don't have a darkroom. Because of the first reason I vas gentile when banging the tank against the working desk, for obvious reasons :wink:. And I think that that was the reason for air bubbles. Do you think that taping with hand against the bottom of the tank might work? How hard are you with this procedure?

    What do you people think shall I do to improve this things?

    Marko
     
  2. Tom Hoskinson

    Tom Hoskinson Member

    Messages:
    3,879
    Joined:
    Mar 7, 2004
    Location:
    Southern Cal
    Shooter:
    Multi Format
    Thanks, Marko.

    I like to use a torus (twisting motion) when I invert the tank. Also, after I fill the tank with developer, I rap it sharply several times to dislodge any air bubbles.

    Are you using a water soak before the developer? I recommend that you do.
     
  3. TPPhotog

    TPPhotog Member

    Messages:
    3,042
    Joined:
    Jul 15, 2004
    Shooter:
    Multi Format
    I have the same problem with my son (again hopefully) being asleep and during the day the dog barks if I bang it down. My method is once I lift the tank I place my other hand underneath. I turn it upside down gently but right it at about twice the speed my hand at the bottom acts as a sudden brake. I then 1/3rd rotate and repeat twice. I am talking smooth not cocktail shaker actions here and I always fill the tank regardless of how many films are inside. HTH Tony
     
  4. marko_trebusak

    marko_trebusak Member

    Messages:
    90
    Joined:
    Aug 31, 2004
    Location:
    Slovenia
    Shooter:
    Multi Format
    Yes Tom, I used 5 min presoak, as you recomended.

    Thank you, Tom and Tony. I'll have another go this weekend and will let you know what happen.

    Marko