Contra Vision® Dual-Color Signage Perforated Window FilmsContra Vision Dual Color Signage Perforated Window Films in 20% transparency allow for internally illuminated channel letters, signs and displays to be transformed at night. The perforated film is applied to the outside surface of the built up channel letters and can appear black or colored during the day and white or colored at night depending on which facefilm is used, Performance Black or Performance White on Black. We recommend these Perforated