reciprocity failure

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reciprocity failure

(res-ă-pross -ă-tee) See photographic emulsion.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

reciprocity failure

[‚res·ə′präs·əd·ē ‚fāl·yər]
(graphic arts)
A phenomenon wherein the usual combination of light intensity and exposure time (following the reciprocity law) required to produce a specified density in a photographic emulsion changes due to especially long exposure time or low light intensity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.