Not all contrast grades are available in all paper types. Graded papers are primarily used in applications such as portraiture, where negative 4 quality and contrast are controlled by standard lighting and processing conditions. In many cases, using these filters with selective-contrast papers will produce contrast ranges much greater than those available with graded papers. To be discontinued when current supplies run out or December 2000. These safelights provide fairly good light level for darkroom work.
Orthochromatic films are sensitive to ultraviolet radiation and blue and green light.
This filter also permits a fairly good light level in the darkroom. Panchromatic films are sensitive to all colors of light as well as ultraviolet radiation. This safelight transmits only enough light to determine contours, not detail. Extended red films are panchromatic films with extended red sensitivity. See the developer, film, or paper instructions for processing and special agitation procedures.