Quote Originally Posted by clay
For really warm prints, try it at 145 to 155 degrees. You can get some good results with even hotter temps, but you start flirting with the possibility of breaking down the sizing of the paper and getting some strange unwanted results. Some papers seem more robust than others. I find that platinotype (yuchhh!) and stonehenge start to break down at 150 degrees or so. Platine and Cot seem to be able to stand hotter temperatures. Whatman's is pretty robust as well. As always, YMMV.
I am confused as to exactly what you are doing? Are you heating the ferric oxalte to mix it from powder, or heating it before mixing it with the sodium chloropalladite, or heating it after combining withe the sodium chloropalladite?