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

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
> 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