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Thread: TF-4 vs. TF-5 for FP4+ Developed in Pyrocat HD?

  1. #11
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
    Posts
    11,660

    Re: TF-4 vs. TF-5 for FP4+ Developed in Pyrocat HD?

    Particles? I've been using TF4 for both film and paper for many years in numerous developers with no problems whatsoever. You do need to gently shake the
    the bottle before pouring the stock solution to be diluted. And with new bottles, you might need to use a stir stick first. That is the only nuisance issue I can think of. If you are losing bits of emulsion, either you are developing way too warm, or else you're film is very old. Of course, I'm assuming you've correctly diluted the TF4 and are not using the concentrate directly. Always dilute and mix just enough concentrate immediately prior to the work session. If settling occurs during that, just gently agitate your bottles or trays right before the film goes to the fixer. I usually give TF4 a tiny swish just before pulling film from
    the stop bath, which should be mild to prevent offsetting the alkalinity of the TF4. But I have no background with TF5. Why not just call the chemist at
    Formulary?

  2. #12

    Join Date
    Aug 2011
    Location
    Seattle Area
    Posts
    1,540

    Re: TF-4 vs. TF-5 for FP4+ Developed in Pyrocat HD?

    I started using TF-4 with my pyro developer in the mid 90s, I switched to TF-5 for its odorless attribute. But TF-5 will smell a little when it gets near to exhaustion.

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