Cuprotype (Paterson)

The name Cuprotype can be ambiguous, sometimes referring to a copper toning process, sometimes to a technique. That is why I specify Paterson here. Cuprotype is an underused alternative process invented in the 1880s by Obernetter and modernised by Jim Patterson. https://www.darkroomdoc.com/post/cuprotype https://porfolio.gorga.org/cuprotype https://www.alternativephotography.com/cuprotype-process/