KODAK GBX Safelight filter

The GBX-2 (ruby red) is a universal safelight filter that can be used in dental or medical darkrooms where both intraoral and extraoral film are processed. It may also be used in darkrooms where manual processing is performed, provided that the film handling under safelight conditions is limited to approximately 2.5 minutes. Frosted bulb of 15 watts or less should be used in the safelight, which should be at least 4 feet (1.2M) from the film.