This page provides all possible meanings and translations of the word safelight
Random House Webster's College Dictionary
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:
the lamp in a darkroom
A safelight is a light source suitable for use in a photographic darkroom. It provides illumination only from parts of the visible spectrum to which the photographic material in use is nearly, or completely insensitive.
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