What is the origin of the name "The Green Room" in the context of actors and the stage?

The greenroom took its name from the fact that its walls were often painted green to rest the eyes of actors after exposure to bright stage lights.

What is the origin of the name "The Green Room" in the context of actors and the stage?
According to the WordOrgins site:


The exact origin of this theatrical term is not known. The term has been in use for the room in which actors wait for their cues since at least 1701. The first use was in London theaters--the particular theater in question is unknown. Probably, it refers to a room that was actually painted green.