Ilford Multigrade Gelatin Filter Set 6" x 6" (12 filters)

Set of 12 filters, 6 x 6 inches (15.2 x 15.2cm). The box has a couple light marks from storage but filters are pristine, like new. Contrast control with multigrade and variable contrast black & white photographic papers can be achieved in several ways. One of the most widely used ways is through the use multigrade or variable contrast hand filters. A magenta filter absorbs green light and transmits blue; a yellow filter absorbs blue light and transmits green. In this way, high and low contrast images can be made. Ilford produces twelve multigrade filters that are numbered 00 - 5 ½ steps, with the lowest filter number corresponding to the softest contrast. Multigrade filters are very easy to use: no complicated calculations are needed when changing from one filter to another. The exposure time for filters 00 – 3 ½ is the same; that for filters 4 – 5 is double. They can be used above or below the lens and can be cut to fit the enlarger filter drawer.