Why do photographers use red light in a darkroom when developing film?

Question

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Please be detailed concerning to the "photonic theory" by "Einstein"

Answer 1

Photography film has to be developed in complete darkness, no light at all. Photographic PRINTS are made under yellow light but the FILM is developed in complete darkness. Red lights are used in camera work for commercial printing to make printing plates. It is done this way because the film is configured to read red as black...so the film reacts to red light in the same manner as it does to no light at all

Answer 2

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Answer 3

while printing photographs in a dark room an ordinary light will expose the the photographic paper however a red light will not expose the black & white paper. Red light is only used in black & white darkroom priniting not in colour. You can not use any light for film developing as it will expose the negative or positive film.
I hope this helps a bit and as far as Einstien goes I have no idea what he had to do with B & W darkroom printing. May be he was interested in photography, not sure though.

Answer 4

Actually, they don't use a red light when developing film. Film has to be loaded into a developing tank in total darkness as it is sensitive to all light. Once it is safely in the tank developing can be carried out in the light. However, photographs can be enlarged and printed using a red 'safe light' as the paper on to which they are printed is not sensitive to red light. I'm not sure what your point is concerning Einstein etc. The main question really has nothing to do with him.

Answer 5

Red Light Photography

Answer 6

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Most black and white printing paper is not sensitive to red light. Thus, a red light in the darkroom provides a small amount of light by which to see what you're doing without the risk of fogging the paper. Silver halide crystals tend to naturally be sensitive to ultraviolet and blue light, with little to no sensitivity in the longer visible wavelength range. By special sensitization, silver halides can acquire sensitivity in the mid(green), and also in the long wavelength(red) range of visible light. Even further special arrangements can give sensitivity to infra-red. By the way, each wavelength range must have its own separate light-sensitive layer in the emulsion. This is where the "Tri" in Tri-X comes from. Anyway, though, in film red sensitivity is a very desirable property. With printing papers, red sensitivity would add nothing, since film is generally printed with a full-spectrum light source. Thus, red sensitivity is left out of papers to allow them to be handled, exposed, and developed under a red safelight. Black and white film, and all color materials(film and paper) must be handled in complete darkness, as they are red-sensitive.

Answer 7

They don't ... where did you get that idea? The only time red light is used is when ortho-lithos are being processed. All film is loaded and developed in the dark. Black and White paper is exposed and developed in a room which is lit by an OC filter.

Answer 8

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RE:
Why do photographers use red light in a darkroom when developing film?
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Answer 9

Red light does not cause the film to be exposed. Regular light would ruin the picture, over exposing it, making everything turn bright and stuff.

Answer 10

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