Terre Verte, literally 'green earth'. This version is sourced from the Bohemia region of the Czech Republic which has a long history of providing this pigment and is widely regarded as the best quality available. It is has a higher chroma than all other Terre Vertes I have seen.
In my experience when dealing with earth pigments the quality makes a huge difference in terms of the depth of hue and the subtle shifting visual qualities of an essentially natural product.
A genuine terre verte is harder to find nowadays as the big paint manufacturers like to pump up it's chroma with artificial pigments ignoring it's subtle nuances.
Classically it has been used as a kind of imprimatura in portraits then glazed over with crimson to give deep fleshy hues.
Pigment - PG23
Opacity - Semi-Transparent
Tinting Power - Low
Binder - Linseed Oil