Films are designed to be exposed within a limited but practical brightness range. Reciprocity failure occurs when a film is exposed under conditions that are not within its design range. It usually becomes evident with very low shutter speeds, such as those used in dim night scenes. As a result of reciprocity failure, colour balance will sh...
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http://www.encyclo.co.uk/local/21048
As film is exposed to light, it becomes less and less sensitive. The longer it is exposed, the less sensitive it become. On longer exposures, where the meter says 10 seconds, depending on the film it may take up to 1 min to expose the film properly due to reciprocity failure of the film. Films are designed to be exposed within a limited but practic...
Found on
http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl
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