This is a Rosco E-Colour+ #525 Argent Blue Filter. The E-Colour line is Rosco's comprehensive system of European color filters for film and video production. E-Colour encompasses a huge range of material for color effects, alteration, diffusion and reflection. Whether you are in film or TV, video or digital, E-Colour has something for you.
These filters are produced with the highest standards and latest dye formulations and bonding technology. Rosco assures the highest levels of reliability and performance.