Cuprotype by Jim Patterson

Cuprotype history from 1850s until present

A Cuprotype is a photographic print of Copper II Ferrocyanide on paper or fabric. Jim Patterson gives us a history of the Cuprotype process. Writer / Jim Patterson with help from Niranjan Patel, Peter Friedrichsen, Frank Gorga, and Alberto Novo Photography / Jim Patterson, Peter Friedrichsen, Alberto Novo, Niranjan Patel and Frank Gorga A Cuprotype is a photographic print of … Read more

Kelp carbon print by Jim Patterson

Kelp carbon process – A direct positive carbon photographic process

Kelp carbon is not for the beginner. The kelp carbon process is a direct positive carbon photographic process. Jim Patterson shares his process. Writer and photography / Jim Patterson In short: Sodium alginate (from kelp) is the Colloid and Ferric (iron iii) Oxalate is the Sensitizer. The image is pigment bound to a support in the hardened (insoluble) colloid. What … Read more