Rosco Cinegel #3004 Filter – 1/2 Density Soft Frost – 48″x25 Roll
Rosco 1/2 Density Soft Frost
Deep-Dyed Polyester Base
Cinegel color and correction filters are manufactured using Rosco’s unique deep-dyed technique. This process begins with a 48” (1.2m) wide roll of clear PET polyester that is passed through a heated dye bath. The bath causes the film to swell, expanding the polymer structure and allowing the dye molecules to penetrate into the base film. As the polymer contracts to its normal form, the dye is trapped below the surface.
