-Safelight Filters Filter Designation Color OA Greenish Yellow Use With Black-and-white contact and duplicating materials and projection films OC No. 1 No. 1A No. 2 *No.
All the operations should be performed using a safelight filter appropriate for ordinary bromide papers, such as a Kodak OC (light amber) filter.
Unfortunately you can't just stick a 200 watt red light in your darkroom and wonder what all this " dark" business is about. Because the paper is "relatively" insensitive to red light and because the red dyes in the safelight filter are not 100% ...
 See also: Filter, Photograph, Safelight, Back, Photography
  
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