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Rosco CTB Blue overview. Roscoe Full Blue CTB Color Conversion Gel Filter - This filter is traditionally used to convert tungsten lighting to daylight. CTB (Color Temperature Blue) filters are available in a full spectrum of degrees (strengths) which, depending on your needs, can be used to either raise the temperature of your lighting or to create different lighting interpretations. CTB filters offer you complete control when shooting under tungsten lighting.
Gelling for tungsten yields similar, but different problems. Fortunately, tungsten is easier -- and more forgiving. First of all, when we gel for tungsten, we use an CTO gel, which is orange and converts our daylight-balanced flash to tungsten (or incandescent). This means that our little flash has basically been turned into a normal light bulb, as far as light color is concerned. As you can imagine, this is gonna be pretty orange.