Re: ferric oxalate
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:
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.
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
> will form silver oxalate, which is insoluble. I do not suggest this
> substitution, though someone tried it.
>> Thanks to all to answer. 1. - I don't have magnetic mixer. 2. -
>> ferric oxalato that I am mixing is of yellow color. 3. - 2 days
>> 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
>> amónico for the same purpose?. Thank you and excuse for my English,
>> text translated by computer