Krypton exits in the earth’s atmosphere as a gaseous chemical in low concentrations (about one part per million). It is a gas that is odorless, colorless, and has no taste. It is very hard and expensive to extract krypton from the atmosphere but it is done. Krypton is most commonly found in lighting because when an electrical current is applied it produces a very bright light. Florescent lights and neon signs commonly use krypton.