"Swiss green.
Rub auripigment well on a stone. Add a pea-sized amount of Lombard indigo and add that to a lot of ox gall. Mix everything together and it will turn out a nice green. Shade with indigo or blueberry juice or attichberry juice; spread the shading carefully. You can also use sap green or a rich azurite to shade the Swiss green; highlight with lead yellow."