[alt-photo] Re: Fluka / Sigma-Adrich Ammonium Iron(III) Citrate - contains Fe(II)!!!

[Alberto Novo]

> 2. I'm going to test in order to find the min. amnt. of peroxide that cures the problem. (Tell me if you want it to share here later...) OTOH, I'm not sure if there's any adverse effect in adding peroxide to the stock solution, both in terms of stability and picture-making. I would definitely like to have your comments and warnings (if any) on this issue.

In the old texts (don't ask me which one, I am only remembering...) it was 
recommended the use of potassium permanganate in order to oxidize the 
iron(II). However, I don't see any adverse effect of H2O2 if you add it drop 
by drop, checking for the blue reaction after each drop. 

Alberto
www.grupponamias.com
www.alternativephotography.com/articles/art102.html