👉 The term "blacklight" is used in the context of light sources and devices. Blacklight refers to a type of light source that uses a mixture of mercury (which is known as mercury vapor) and carbon dioxide gas, which is used to produce a high intensity of light when exposed to an electric field. The color of the light produced by a blacklight can be varied, and it can be used in various applications such as testing chemicals, analyzing materials, and illuminating surfaces or objects.