Availability: Backorder, Usually leaves warehouse in 1-2 weeks
Deep-dyed color filters, like Roscolux, begin with a roll of clear polyester. The film is passed through a bath of heated solvent suffused with dye. The solvent causes the film to swell expanding the polymer structure and allowing the dye molecules to penetrate the surface. The film is then washed and the polymer contracts to its normal form, trapping the dye molecules below the surface. Compared to surface coating, more extreme temperatures are required to cause the dye particles to sublimate through the surface. Deep-dyed filters are, therefore, more resistant to fading than surface coated.
Rich deep indigo blue. Slightly more red than 81. (Transmission = 10%).
Roll Size: 24"x25ft.
Light Reduction: 3.3 f-stops