Actually, the filter is salmon colored. It is used to expose Type A color film in daylight. Type A film is balanced for 3400K photofloods, and it is rarely, if ever, seen these days. The 85 is a less intense version of the 85B. These are light balancing filters, and they are not really designed for contrast work. They pass all colors, but they pass more light at the red end of the spectrum. An 85 would produce some darkening of the sky and lightening of the yellows and reds with black and white film, but not nearly as much as an orange filter, or even a deep yellow.