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safelight

[seyf-lahyt]
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noun Photography.
  1. a darkroom light with a filter that transmits only those rays of the spectrum to which films, printing paper, etc., are not sensitive.

Origin of safelight

First recorded in 1900–05; safe + light1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for safelight

safelight

noun
  1. photog a light that can be used in a room in which photographic material is handled, transmitting only those colours to which a particular type of film, plate, or paper is relatively insensitive
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012