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  1. #21

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    I purge my concentrate bottles with nitrogen after I remove enough to mix one or two liters and they seem to last at least 8 months or so after opening. I had one croak, but there was only enough left in it for a liter of developer and it had been opened and purged multiple times. The part B turned an ugly black, guess I didn't do a good job on purging that little bottle. This was a set packaged in 2007, week 29 and the source for the test bottle mentioned above. It would have been opened in mid 2009. I forgot to record that date.

    Factory sealed they are ok for two years according to Kodak, pretty sure they keep at least three years or maybe longer.

    I had a set packaged in 2008, the part B was still good, but the part C bottle had been jammed into a nail in the back of the storage cabinet at some point in time and most of that bottle was in the bottom of the zip lock bag I keep each set in. That set was disposed of the other day. The nail has been neutered as well.

    The part A of that set was slightly darker than the newer sets I have, so it seems to darken with age, but I don't know if that has any bearing on the capacity or what.
    Bob

  2. #22
    hoffy's Avatar
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    I don't know if there are differences, but I have been recently using a Tetenal RA4 kit that I opened in May last. While I had to throw out the working solution that I still had mixed from back then (including the bottle that had the dev in it - it had gone black and flakey), the concentrate for both the dev and the blix appears to be OK.

  3. #23
    Photo Engineer's Avatar
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    Yes. But not forever. The developing agent part is not packed under N2, it is packed under SO2!

    PE

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