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For black & white, a safelight (usually red) of proper strength and properly distanced can be used to provide illumination under which one can develop paper prints. This assumes the use of typical (orthochromatic) paper, which is desensitized to red. However, the paper can be fogged if the light is too strong or too close for the total period of time the paper is out of the package until it has gone through the fixing process. Panchromatic paper is sensitive to all colors, therefore it has to be protected from light as if it were color paper.

For color, total darkness is required (obviously except during exposure of the paper). Since that is not practical, developing drums are used to provide the light-tight chamber for the development process.

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