Verdigris green (from French »vert de gris«) is a fairly light bluish green the mixture of which does not seem to contain any yellow. It marks the transition from the green colour to the blue. The name is taken from the common copper(II) acetate (verdigris pigment), because of the similarity with its colour. This is where copper green comes from and the copper green river.
Source: Von den äußerlichen Kennzeichen der Foßilien, abgefaßt von Abraham Gottlob Werner, Vienna 1785