RE: [Norton AntiSpam] RE: Ferric Oxalate or Ferric Ammonium Oxalate
AFAIK, it may crystallize if it's a very strong solution which was kept in low temperature. I can confidently say that the usual 40% solution (1.07M) is quite stable in ordinary room temperature (based on my experience with if after extensive usage in last 2-3 years). IIRC, Mike's New Chrysotype manual says that the 1.4M solution will keep indefinitely (uncontaminated and kept away from UV light in brown bottle) after mixing, waiting (to let crystals form - if any) and filtering. My 1.4M solution haven't formed crystals either after mixing and when I checked it 1 month later... Best regards, Loris. -----Original Message----- From: EJN Photo [mailto:ejnphoto@sbcglobal.net] Sent: 03 Kasım 2006 Cuma 08:46 To: alt-photo-process-l@usask.ca Subject: RE: [Norton AntiSpam] RE: Ferric Oxalate or Ferric Ammonium Oxalate ... I do keep some in the darkroom and use it for Chrysotypes. Since I don't know it as well as FO, I don't want to make any claims about shelf life that I haven't seen. I thought that Mike has cautioned about letting it go too long however as it may form solid crystals of an insoluble form.
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