Re: Dissolving Ferric Oxalate Kallitype

I'm in day two of trying to get ferric oxalate to go into solution. I've made a batch of 50 mls. I've tried microwaving for 20-30 seconds (warm as a cup of coffee, 50 C maybe) and then shaking the bottle for five minutes. I get a milky solution. After about 10 minutes it separates out and I get a nearly clear liquid on top and a chalky sediment on the bottom. I've repeated this at least 15 times in two days. The sediment just isn't budging yet. Is this normal?!

~m
  ----- Original Message -----
  From: Loris Medici
  To: alt-photo-process-l@sask.usask.ca
  Sent: Saturday, January 21, 2006 6:07 AM
  Subject: RE: Dissolving Ferric Oxalate Kallitype

  Maybe you can put the bottle in warm (40 - 50C?) water and shake the warm solution. It may help to dissolve the remaining FO. I mixed FO only once (but hadn't the opportunity to use it - I dumped it a year later, without testing... because I've read that it goes bad in 3 months). Mine was dissolved completely after two days just with the initial shaking/stirring - I didn't visited the solution once I mixed it. Two days later there wasn't any precipitate in the bottle. My FO was from B&S.

  Regards,
  Loris.

------------------------------------------------------------------------------
  From: Michael Koch-Schulte [mailto:mkochsch@shaw.ca]
  Sent: 21 Ocak 2006 Cumartesi 02:40
  To: Alt-Photo-Process-L
  Subject: Dissolving Ferric Oxalate Kallitype

  It's been over 24 hours since I mix my first batch of Ferric Oxalate (20%). I still have about a quarter to half an inch of "sludge" at the bottom of a 100 ml bottle. I've been intermittently shaking the bottle when I get the chance. Should just "stay the course" or is intervention required? Also, how pronouned is the white precipitate when doing the test for presence of Free Oxalic Acid. I'm not sure if I'm seeing just a milkly scum from the undissolved Ferric Oxalate or precipitate. Ferrix Oxalate was obtained from jdphotochem. Thx.

  ~m
Received on Sat Jan 21 10:17:48 2006