Help Needed on NH-5 Concentrate Shelf-Life

Discussion in 'B&W: Film, Paper, Chemistry' started by Lobalobo, Feb 15, 2009.

  1. Lobalobo

    Lobalobo Subscriber

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    Six months ago I bought (from B&H) and used 1/4 bottle of Heico NH-5 Liquid Rapid Fixer. The 3/4 bottle of concentrate (1/4 air) remained unopened at room temperature since then. It looks clear; no particles in it, and while it has an odor, it is not a strong odor (not sure different from when it was fresh). Can I still use it? Thanks in advance. (Caution I know, would say throw it out, but I'd lose the opportunity to work in the darkroom tonight and tomorrow if I do.)
     
  2. trexx

    trexx Member

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    Mix a normal strength batch. Place and inch of film leader in it. I should clear in 30 to 90 sec. If it does you are good to go.
     
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    Lobalobo

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    Thanks, I'll try that eventually, but tonight have only paper. Of course, with paper, I don't risk losing the image, but do risk losing several hours in the darkroom. So do you have a guess as to whether the concentrate is still good? I won't hold you to it, of course (even if I could).
     
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    Lobalobo

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    (By the way, if the response to my question about paper is to develop an image then turn the lights on and see what happens, I did think of that, but I'm not sure that an inadequately fixed print might darken over hours rather than minutes--if the answers is minutes or not at all, then I have my test and apologize for the ignorant questions.)
     
  5. Anscojohn

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    If it will clear film that fast, it is just fine. Be ye not afraid!
    Besides, you use two fixing baths, right!?
     
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    Lobalobo

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    But I don't have any film to test whether it will clear the film that fast. (And I use only one fixing bath, though I know I should probably use two, with prints, right?)
     
  7. trexx

    trexx Member

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    take four test strips. unexposed. develop them all. stop as you would. Fix one 1min, one 30sec, one 5 sec and none not at all. Wash and place them in a tray. Make sure the rest of the paper is safe and turn on the lights. The no fix and the 5 sec fix should turn some black to gray, but the 30 should not and the 1 min most certainly should not.

    Mix the fix 1 part stock and 9 parts water for paper.
     
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    Lobalobo

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    Perfect, and thank you.
     
  9. Anscojohn

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    Yes.
     
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    Lobalobo

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    Fixer was fine; thanks for the help.