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 in 1/2 steps, with the lowest filter number corresponding to the softest contrast.

MFR #1762628