Why dim Red Light is used in photographic room
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Photographic paper reacts to light to produce the image taken by a camera and stored on film. ... Darkrooms used red lighting to allow photographers to control light carefully, so that light-sensitive photographic paper would not become overexposed and ruin the pictures during the developing process.
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Red colour deflects the least and therefore it possess the longest wavelength, hence red light can travel a longer distance as compared to other colours and can be seen from farther distance. Therefore red light is used for signalling. It doesn't make sense if the room is darker or lightened up.
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