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Rosco offers four different ranges of filters, including Cinegel, the Academy Award winning range for filmmakers, photographers and video professionals.
Among the ranges for theatrical and live entertainment, shown here, there are three distinct differences. The most important differences are the colours! Although there are Blues, Reds, Cyans, etc. in every range, the individual filter colours are different. Some say the colours are only slightly different from each other – but professional designers recognize the differences as profoundly different. These differences allow designers to get exactly the colour they want for each effect.
The second difference is the price; compared to Supergel, E-Colour+ is more affordable. The prices are directly related to the cost of manufacturing and materials.
Finally, there are the manufacturing processes, described here in detail. These processes may not appear to be important to you, but they directly affect the durability of the filters and their resistance to the heat of stage lights. |
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SUPERGEL
The original high temperature brand, introduced in Europe in 1976.
Supergel colour filters are body-coloured, a unique manufacturing process in which the colourant is integrated within the plastic substrate. The process starts with powdered resin and dye fed into an extruder. Under intense pressure and heat approaching 315° C, the drive screw combines the melted resin and dye into a through-coloured mixture with the consistency of honey.
This coloured mixture is extruded through a die which forms into the coloured core of a film 61cm wide. The colour is ‘locked in’ between 2 clear outer layers of the film, giving the best protection against colour fade in hot lights.
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ROSCOLUX
Roscolux is far and away the most widely specified theatrical filter in the world.
The range, which has evolved over the past 30 years, has been the choice of American and Canadian designers since it was introduced in 1976. It has been available in Europe only for the past few years. Most of the colour filters in the Roscolux brand are deep-dyed.
Deep-dyed colour filters begin with a roll of clear polyester. The polyester 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.
The deep-dyed process yields colour filters that are more resistant to heat and therefore tend to last longer in stage light, than filters that are surface coated. |
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E-COLOUR+
E-Colour+ is the traditional European colour and correction range. It is based, as are most of the European-produced filter brands, on the original Cinemoid system.
Optically clear polyester film (PET) is coated with a flame retardant and dye solution on one or two sides to a precisely controlled thickness. The carrier solvent is baked off, leaving a stable coating bonded to the clear substrate. Advanced dye technology gives good resistance to dye fade in hot lights.
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