Darkroom light

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Red darkroom light for black and white laboratory

A darkroom lamp is a laboratory photographic aid. It is used to illuminate a darkroom without affecting the photographic material. This is achieved by using light at wavelengths to which the photosensitive material does not respond.

In black and white photography , the darkroom is often very weakly illuminated with a red wavelength . However, this is only possible for the enlargement process, since photo paper is orthochromatically sensitized. Corresponding footage also reacts to red light.

When working with negative film material that is panchromatically sensitized, a weak greenish lamp is used for the rudimentary view of the laboratory assistant.


  • Robert Hirsch: Photographic Possibilities: The Expressive Use of Equipment, Ideas, Materials, and Processes . 3. Edition. Focal Press, New York 2013, ISBN 978-0-240-81013-3 , pp. 113 (English).