Art photo - Sabattier Effect

The Sabattier Effect (often mistakenly referred to as solarization) is caused by exposing the film or paper to light, very briefly, during processing. The half developed image acts as a "negative" and causes a new image to form. This effect usually isn't very useful with black and white materials, but with color paper it can oversaturate the image and give very bold colors.

Sabattier Effect - 1980