Neon Signs are glass tubes which contain neon gas or other inert gases. The tubes are bent into the shape of the sign or logo required and then a high voltage is applied to make the gas glow. The different gases glow different colors (e.g. neon glows reddish orange and argon-mercury glows pale blue). However, the glass tubes can also be coated with phosphors for different colors. The lighting is often bright and colorful and thus creates a great eye-catching sign for commercial and advertising applications.