Weiland effect

Weiland effect

[′wī·lənd i‚fekt]
(graphic arts)
A photographic effect in which a photographic material undergoes greater blackening when exposed at a very high intensity for a short time and then at a lower intensity for a long time than with the reverse sequence.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.