U of S | Mailing List Archive | alt-photo-process-l | Re: Mixing ferric oxalate

Re: Mixing ferric oxalate

The last batch I mixed up took one and a half days to completely go in to solution. I would periodically reheat to about 120 degrees and use my electric stirrer for half an hour and then let it sit for a few hours. It can just take a lot of time on occasion. BTW, I think your proportions are off. I use that amount of ferric to make up 100ml of solution, not 50ml. That would explain a lot of it.


On Sep 9, 2006, at 2:06 PM, John Brewer wrote:

Dear list

I'm mixing ferric oxalate solution from powder and it just isn't going into solution. I used 27g ferric oxalate with 4.8g oxalic acid and 2g EDTA (Na4). I used hot distilled water to 50ml. I've been stirring for 3/4 hour and I still have a yellow green opaque liquid and my hand is about to fall off. Is it normal to take so long? Can I reheat a little? Any tips/ideas?




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