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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.
Only Iodine and Bromine are used in halogen tungsten lamps. A.) The lamp is turned on and the filament begins to glow red as more current passes through it. The temperature rapidly increases. The halogens boil to a gas at relatively low temperatures: Iodine (184 C) or Bromine (59 C).