PC-TEA, can the stock solution go bad?

Discussion in 'B&W: Film, Paper, Chemistry' started by MikeM1977, Apr 19, 2008.

  1. MikeM1977

    MikeM1977 Member

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    I think I might have just experienced a development failure using some old PC-TEA stock that has sat for about about 1.5 years in a 3/4 empty bottle.

    Either that, or I mislabeled the bottle (and used Instant Mytol A solution instead).

    Is PC-TEA supposed to last a long time in a 3/4 empty plastic juice bottle?

    The film didn't develop. Mostly clear (can barely make out exposed frames)
     
  2. gainer

    gainer Subscriber

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    What color was the stock? Try a snip test to see if it still has a kick. It's a good idea to do that with any developer before you trust it with something valuable. Develop a bit in room light for 2 minutes. It should be pretty dark by then.
     
  3. MikeM1977

    MikeM1977 Member

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    I think its more likely the stock I used was indeed Instant Mytol and I mistakenly thought it was PC-TEA. I need to get more organized :smile:
     
  4. P C Headland

    P C Headland Subscriber

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    I'm glad you think you've sorted it out.

    My opened bottle of PC-TEA concentrate is now over a year old, and has gone a nice dark colour. Still works just as well as the day I made it.
     
  5. juan

    juan Subscriber

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    I have some PC-TEA that is at least two years old and it works fine. But I keep mine in a glass bottle. I think, although I am not a scientist, that keeping developers in glass is important. The sides and bottom of most plastic bottles lets oxygen in.
    juan
     
  6. Snapshot

    Snapshot Member

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    Yes, my stock has gone dark but it works fine as well.
     
  7. gainer

    gainer Subscriber

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    The Dow web site has extensive date about the ethanolamines, mono- di- and tri-. TEA will turn dark with heating, but there is no mention of loss of potency. The problem with darkening is that most people don't want dark colored cosmetic ointments, tonics or shampoos.