Galalith (Erinoid in the United Kingdom) is a synthetic plastic material manufactured by the interaction of casein and formaldehyde. The commercial name is derived from the Ancient Greek words gala (γάλα, "milk") and lithos (λῐ́θος, "stone"). It is odourless, hard, resists humidity to a certain degree, is antistatic, also an electrical insulator and virtually nonflammable. It was produced under a plethora of other commercial names such as aladdinite (in the US), Casolith (in the Netherlands) and lactoloid (in Japan).