This color is an extinct pigment, and for good reason. It is not very stable in artists' applications. Specifically, Verdigris is not that good for oil painting, though it was used throughout art history and holds a few mysteries. This color is toxic, and also changes color wildly in oil paints.
An interesting exploration of this paint in oils was done by an artist who goes by the name Yellow Oxide here. Their explorations show a dramatic darkening when mixed with Cadmium Yellow.
The sample also changed color noticeably without mixing- from a cobalt-teal green to a minty phthalo-like color. Even the dry pigment undergoes color change, eventually settling to a deeper green as is seen here.
This color is associated with toxicity and Artiscreation assigns a B. We treat it as though it were more toxic than that.
