Ferric oxalate - how old is too old?

Discussion in 'Alternative Processes' started by sly, Apr 11, 2009.

  1. sly

    sly Subscriber

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    I've not done any pt/pd prints since the fall. I've been trying to do test strips today, and my exposure times are getting up to 16-20 minutes and they still look lousy. My usual times with my tanning lights are in the 3-8 minute range.

    I'm using Na2 method. Bought the chemicals in solution from B&S. I think my ferric oxalate solution is from last summer. It might be older. It has been kept in the fridge when not in use. Is it just too old? I think I've read that the other solutions will keep forever, but the ferric oxalate expires eventually.
     
  2. Jarvman

    Jarvman Member

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    I heard a year with the B&S ferric oxalate. Sure hope thats true, haven't got my first print yet!! Suppose it all depends on the climate though :-|
     
  3. Jim Graves

    Jim Graves Member

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  4. pateeid

    pateeid Member

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    have u test PH? it should be around 5.6-5.8
     
  5. 36cm2

    36cm2 Member

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    I spoke with B&S about this a few days ago, very randomly, and they told me ferric oxalate should last 6 months.