Thanks for posting your experiment. I think that the alternative print community benefits from a free and open exchange of methods and experiments. Plus it keeps us from all repeating the same mistakes .Originally Posted by Donald Qualls
The increase in speed might be more significant if the oxalate salt of iron was used, but I have no data on this. Only a suggestion.
I think that the traditional method for cyanotypes shows an advantage when it comes to development. The two solutions are on the paper. With brushing on the ferricyanide, you open the possibility of uneven development. Perhaps if you had a super saturated solution of potassium ferricyanide that you developed your print in? That might take care of washing away the ferric ammonium citrate to early. Just a suggestion.