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  1. #81

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    OK the OP's solution is a pre-wash which cures the lack of density and prevents the yellowing of the developer which is Xtol.

    What is the connection between the OP's solution and lack of chelating agents that Ralph mentions?

    Perhaps more importantly what might a pre-wash do to cure both the above problems and why do a lot of other users not need to do a pre-wash?

    There still seems to a number of questions to answer.

    I have a number of TMY2 films already exposed and awaiting development and I am still plagued by uncertainty. Do I need to do a pre-wash?

    I cannot see a logical connection between the solution and a pre-wash and Kodak doesn't say one is required. On the other hand I don't want to end up with the OP's problems with my negs.

    pentaxuser

  2. #82
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    Quote Originally Posted by pentaxuser View Post
    OK the OP's solution is a pre-wash which cures the lack of density and prevents the yellowing of the developer which is Xtol.

    What is the connection between the OP's solution and lack of chelating agents that Ralph mentions?QUOTE]

    There is no connection.


    Perhaps more importantly what might a pre-wash do to cure both the above problems and why do a lot of other users not need to do a pre-wash?

    There still seems to a number of questions to answer.

    I have a number of TMY2 films already exposed and awaiting development and I am still plagued by uncertainty. Do I need to do a pre-wash?pentaxuser
    NO! AND IT WON'T HELP. THE XTOL FAILURE IS CAUSED BY DEVELOPER CONTAMINATION WITH IRON OR COPPER IONS, WHICH ARE EITHER IN HE WATER OR THE RAW CHEMICALS USED.ONLY THE PRESENCE OF A CHELATING AGENT WILL Hhelp. i'm using salicylic acidbut others are known to work.
    http://en.wikipedia.org/wiki/Salicylic_acid
    Last edited by RalphLambrecht; 09-30-2012 at 06:39 AM. Click to view previous post history. Reason: adding info
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  3. #83

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    Thanks, Ralph, for the explanation. In my water area I have never experienced any problem with Xtol and any of the films I have developed so far (both Ilford and Fuji) so it would appear that I don't suffer a problem of copper or iron ions in my water and there will be no barrier to success with TMY 2.

    pentaxuser

  4. #84

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    Quote Originally Posted by pentaxuser View Post
    Thanks, Ralph, for the explanation. In my water area I have never experienced any problem with Xtol and any of the films I have developed so far (both Ilford and Fuji) so it would appear that I don't suffer a problem of copper or iron ions in my water and there will be no barrier to success with TMY 2. pentaxuser
    My problem was that reasonably fresh XTOL and freshly mixed home-brews were both failing identically. Metal ions were not the problem, because a pre-wash restored normal density. I suggest doing a pre-wash as a precaution; it won't hurt and might help. Some will say that a pre-wash changes dev-times. That's true: Due to higher density with TMY-2, you might want to decrease dev-time.

    Mark Overton

  5. #85
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    i had a very similar problem with a home brew(in another apug thread), an d my problemturned out to be metal ions ,not in the water but in the raw chemicals used!it's not always the water. how did a prewash return density?
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

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