Super Blue Question

Dear Users,

@ Christopher James Book "The Book of. Alternative Photographic Processes" at page 70 you will find figure 11-6 "Fumed Silica Blueprints Compared" with following citation:
[...]Super Blue formula using ammonium ferric oxalate, ammonium oxalate, and potassium ferricyanide in the sensitiser and a potassium ferricyanide and ferric ammonium oxalate developer[...]

So far I know this sensitizer is equal to the recipe from Mike Wares "New Cyanotype Process", but what is the "potassium ferricyanide and ferric ammonium oxalate developer"?

Does somebody know this "Super Blue Process"?


Bj68

Looks like not too many cyanotype practitioners (I am not one) around. Your question is intriguing...developer looks like the same as the sensitzer. Also, it would seem there a typo in the sensitizer which lists ammonium oxalate - in Ware's cyanotype there is ammoinum dichromate not oxalate (unless of course this is not a sensitizer based on the the new cyanotype but something else.)

I think "cynotype Rex" used ferricyanide as the developer (I guess Herschel originally did it that way.) But in that case, you wouldn't want to use it in the sensitzer as well. It beats me why one would use "ferric ammonium oxalate" in the developer. Also, is it different from "ammonium ferric oxalate" in the sensitizer?

There is one more example where ferricyanide is used as a developer that I know of: http://www.alternativephotography.com/how-to-produce-low-contrast-cyanotype-prints/

Other than that I have no idea. The caption in the book also mentions (courtesy of the artist) but no name that I can see on google books (this reference is not there in my older edition.) Did James (or the Publisher) just mess up?

:Niranjan.