Definition of Solarisation

See also Solarization for the effect in physics in which the properties of materials are affected by electo-magnetic radiation - note the spelling Solarization is also often used for the photographic effect

Solarisation is a phenomenon in photography in which the image recorded on a negative or on a photographic print is wholly or partially reversed in tone. Dark areas appear light or light areas appear dark. The term is synonymous with the Sabattier Effect when referring to negatives, but is technically incorrect when used to refer to prints.