FDC 3635 Series is 3M™ 3635 Light Management Films – Dual Color Films. These films are used to create the special effect of a color/image by day (non lighted) and a different color by night (backlit). This is achieved when a background color/image glows through the perforations in the dual color film. From a typical viewing distance for large format graphics, viewers will notice little or no perforation pattern. Dual-color films are available in 222 black or 210 white. To order punched material, use part number 3685.