photoemulsions on alternative paper (watercolor etc.)

Hello:

Although people say silver gelatin is just a fancy term for b/w photo, what do you call the processes where people apply an emulsion with a brush to other substrates, like perhaps watercolor paper?

Someone recently showed me some 4 x 5 palladium prints, and I didn't think to ask whether that was a printing technique used with conventional negatives, or if it was a paper negative type of process - used as film in a camera.

For very large format (11 x14 and larger), are there any economical processes to hand apply silver-based chemistry to paper?

I have a large pinhole application in mind (18" x 24" bellows) and perhaps might try a simple homebrew lens with it someday.

Newspaper film is one option I'm considering (14" x 25").

Thanks

Murray

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