The color of neon light is related to the gas it is filled with. Filling argon will emit light blue light, filling helium will emit light red light, filling mercury vapor will emit green purple light, filling neon, argon, helium, mercury vapor and a mixture of four gases. Due to the different proportions of each gas, you can get colorful neon lights.
Neon: Sometimes a second rainbow can be seen on the outside of the rainbow. The brilliance is slightly lighter than the first rainbow. The color sequence is ultraviolet and red inside, which is opposite to the rainbow.
Rainbow: It was originally meant to be a natural phenomenon, that is, rainbow, which is also colorful. The color sequence from outside to inside is red, orange, yellow, green, blue, indigo and purple.
Neon lights: Colorful lights used at night to attract customers or decorate the night scene.