Chemogram
From Wikipedia, the free encyclopedia
A chemogram (from "chemistry", "optic" and gramma, Greek for "things written")[1] is an experimental art where a photographic image is partly or fully enlarged and processed onto photographic paper in the darkroom and afterwards selectively painted over in full light with chemicals used in photographic processing. Due to the production process chemograms can be considered works of abstract photography.
Not to be confused with Chemigram.
Chemograms were invented in 1974 by the German photo artist Josef H. Neumann.