Quote Originally Posted by gmikol View Post
Can anyone reading this thread explain the chemistry of clearing these prints, especially the role of the potassium permanganate? For reference, the formula can be found here.

--Greg
+1

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Inkjet papers contain dye mordants much like dye-transfer paper, which is what I transferred a q&d Ultrastable test to. Like your experience, a brown stain appeared in the next couple hours.

I have seen these compounds (diazo/azido) referred to as dyes before.

If your fixed-out FB paper was treated in a hardening fixer containing chrome alum or the like, you could expect this to have a mordanting effect as well, though significantly lower. It therefore might be interesting to observe what happens with photo-paper that was fixed out in a non-hardening fixer.