clayden effect

clayden effect
\\ˈklādən-\ noun
Usage: usually capitalized C
Etymology: after Arthur W. Clayden died 1944 English meteorologist
: partial desensitization of the emulsion layer of a photographic material by an initial high-intensity exposure of very short duration so that a later exposure of lower intensity and longer duration produces less effect than expected from the combined exposures, sometimes resulting in reversal of an image — compare dark lightning

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