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The GBX-2 (ruby red) is a universal safelight filter that can be used in dental darkrooms where both intraoral and extraoral films are processed. It may be used in darkrooms where manual processing is performed, provided that film handling under safelight conditions is limited to approximately 2 1/2 minutes. Frosted bulb of 15 watts or less should be used in the safelight, which should be at least 4 feet (1.2 m) from the film.
