Re: ferric oxalate
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.
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: *