Historically used as a bole for gilding and as underpainting for flesh tones in Medieval painting (verdaccio), Terre Verte, or green earth, was made from volcanic celadonite and/or a mineral of sedimentary origin; Robert Gamblin mixed this color because true natural green earth pigment is unpredictable in color and availability. Gamblin Terre Verte is an excellent color for grisaille; it has a weak masstone and very muted tint.