Re: ferric oxalate
Juan, Many people tried to substitute Ammonium Iron(III) Oxalate (AFO) in place of Iron(III) Oxalate (FO) for making Kallitypes (including me). Unfortunately as Alberto says Ammonium Iron(III) Oxalate + Silver Nitrate will form insoluble compounds and won't work well (or won't work at all). See "Satista" process for using AFO with Silver Nitrate: http://www.alternativephotography.com/process_satista.html I tried this also, the result wasn't good -> but I must admit I didn't try enough/hard, just one trial... Try and see it yourself. Marek Matusz and Philippe Ayral have very nice Satista prints -> maybe they'll chime in to provide information with all the experience they have. Regards, Loris. 6 Nisan 2009, Pazartesi, 9:22 am tarihinde, Alberto Novo yazmış: > Yellow Fe oxalate = ferrous oxalate, insoluble in water both cold and hot. > Ferric oxalate is green > > In iron(III) ammonium oxalate there is too much oxalate, so that some > silver > will form silver oxalate, which is insoluble. I do not suggest this > substitution, though someone tried it. > > Alberto > >> Thanks to all to answer. 1. - I don't have magnetic mixer. 2. - >> the >> ferric oxalato that I am mixing is of yellow color. 3. - 2 days >> mixing >> and alone there is yellow mud in the bottom. 4. - if he/she ended up >> mixing completely, I believe that he/she would have color yellow ocher, >> never clear and transparent. 5. - the formula that figures in the >> bottle is: * >> Fe(CoO)_2 **2H_2 O * >> 6. - I also have oxalato ferric amónico. The formula that figures in >> the bottle is: >> >> * (C_2 O_4 )_3 Fe(NH_4 )_3 4H_2 O* >> 7. - I am preparing this mixture for kalitípia processes. My >> question: Could it substitute the ferric oxalato for the oxalato >> ferric >> amónico for the same purpose?. Thank you and excuse for my English, >> text translated by computer > >
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