ABOUT SOLAR PLATE ETCHING:
The Solar Plate is a metal plate with a light-sensitive polymer surface that is water soluble. To make a solar plate print you must create the artwork image on a transparent film, place that on top of the solar plate and expose both to sunlight for a few seconds.
The polymer hardens wherever ultraviolet light strikes the plate's surface, while the part of polymer blocked from light remains soluble. The plate is then scrubbed in water, which washes away the soft bits and leaves lines and grooves "etched" into the polymer.
The plate can be inked and used either as an intaglio or relief printing plate. It's a nontoxic method that produces lovely, detailed images.