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Neon signs give off a characteristic bright red to reddish-orange light. Other colors are created by using argon and Mercury, and coating the inside of the tube with phosphors that emit the desired color when ionized. The mercury ionizes and emits ultraviolet (UV) radiation. The UV light slams into the phosphor coating, and the phosphor emits light. The color of that light will be determined by the composition of the phosphor coating.

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