Kodak Safelight Filters are scientifically designed for safelight lamps. When used as directed, Kodak safelight filters provide maximum safe illumination, plus protection from white light.
This safelight filter is a 3-1/4 x 4-3/4" - No.GBX-2 Dark Red Filter for use with blue-sensitive x-ray film, & green-sensitive medical x-ray film.