Nidelva river through Trondheim Norway

Nidelva river through Trondheim Norway
by Saaru Lindestokke                

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Alternative photographic processes, including historical and non-silver processes and "unusual" uses of traditional processes such as polaroid manipulation.

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What is the process behind cyanotype printing?

I'm finding the actual literal process, but I'm looking for the chemical process. I've found many sources of the chemical reaction involved, but has anyone found info on the physics behind it? Such ...