Quote Originally Posted by tim_bessell View Post
Actually, I used the 'old' stuff to make a gelatin cyanotype, it turned out beautiful. It was on the same Fabriano paper I am having so much trouble getting my silver gelatin emulsion to stick to. Which make me want to give this paper a sub coat of Knox before coating the silver gelatin.

PE, do you think this box of Knox is an active gelatin?
Cyanotypes are insensitive to the ingredients in gelatin that make it act on Silver halides. Just about any kind of gelatin will work on many alternate light sensitive systems.

I can't tell if this is active, but I would guess that it is. After all, why go through the expensive and lengthy oxidation and extraction process to make it inactive, when the active gelatin is harmless to humans?

PE