## black film

Also contains definition of: common black film
https://doi.org/10.1351/goldbook.B00678
A @[email protected] thinner than about $$\frac{1}{4}$$ @[email protected] of @[email protected] light. Black films are often @[email protected], but equilibrium films may be considerably thicker under some conditions. In @[email protected] films, two types of @[email protected] are often observed: the one characterized by thickness of the order of $$7\ \text{nm}$$ or more which varies significantly with minor changes in composition such as @[email protected], is called common black film.