How to make neon lights

The method of manufacturing neon lights is to use sodium calcium silicate glass with low melting point as the lamp tube, design different patterns and characters according to needs, process them with blowtorch, then sinter the electrodes, evacuate them with vacuum pump, and fill different rare gases according to the required color. Now the neon lamps are more exquisite. Some bend the glass tubes into various shapes to make more moving graphics; Others paint fluorescent powder on the inner wall of the lamp tube to make the color more bright and colorful; Some neon lights are equipped with automatic igniters, so that the lights of various colors are illuminated and extinguished one after another, adding radiance to each other, and making the city night colorful.