A way of treating photographic emulsions to prevent their sensitivity falling off rapidly when used for long exposures. The commonest method is to soak the film in a chemically reducing gas (a 8% hydrogen 92% nitrogen mixture is popular for amateur use).
The immunological process by which hypersensitivity is induced. ... (05 Mar 2000) ... 
(hi″pәr-sen″sĭ-tĭ-za´shәn) the induction of hypersensitivity.
Type: Term Pronunciation: hī′pĕr-sen′si-ti-zā′shŭn Definitions: 1. The immunologic process by which hypersensitivity is induced.