Rosco's premier range of filters, Roscolux, is manufactured in a unique technology to insure the longest possible life under hot theatrical lights. Three discrete layers are combined in a tri-extrusion process. By sealing the colored layer between two microscopically thin layers of clear film, dye migration is minimized and effective life is extended. Roscolux is currently the most widely used filter range in the world.

Roscolux 78 Trudy Blue: a rich clean red blue that warms to lavender when dimmed.