What is a typical dark room safelight filter?

What is a typical dark room safelight filter?

• A. Dryer
• B. Fixer
• C. Developer
• D. GBX

Answer: (D)

Safelight filters are chosen to illuminate the darkroom without fogging the film. X-ray film is sensitive to blue-green and other shorter wavelengths, so a safelight uses a filter that passes long-wavelength red/orange light while blocking those shorter wavelengths. GBX is a standard safelight filter designed for this purpose, providing red illumination that minimizes fogging of the film. The other items aren’t safelight filters at all. A dryer is a device for drying film, while fixer and developer are chemical solutions used in processing. They don’t serve as the safe illumination that protects film from fogging.

Safelight filters are chosen to illuminate the darkroom without fogging the film. X-ray film is sensitive to blue-green and other shorter wavelengths, so a safelight uses a filter that passes long-wavelength red/orange light while blocking those shorter wavelengths. GBX is a standard safelight filter designed for this purpose, providing red illumination that minimizes fogging of the film.

The other items aren’t safelight filters at all. A dryer is a device for drying film, while fixer and developer are chemical solutions used in processing. They don’t serve as the safe illumination that protects film from fogging.