solarise

reverse some of the tones of (a negative or print) and introduce pronounced outlines of highlights, by exposing it briefly to light, then washing and redeveloping it

become overexposed; "The film solarized"

overexpose to sunlight; "be careful not to solarize the photographic film"

expose to the rays of the sun or affect by exposure to the sun; "insolated paper may turn yellow and crumble"; "These herbs suffer when sunned"