## black film

Also contains definition of: common black film
https://doi.org/10.1351/goldbook.B00678
A @F02366@ thinner than about $$\frac{1}{4}$$ @W06659@ of @VT07496@ light. Black films are often @E02181@, but equilibrium films may be considerably thicker under some conditions. In @S05721@ films, two types of @E02181@ 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 @I03180@, is called common black film.