A personal favourite.
Heated or calcined version of the Italian raw sienna, oil+earth+heat, simple and classic. The pigment is sourced in the Siena region of Italy and like all Rublev paint contains just pigment and oil, it's sienna that's really from Siena, the proper authentic version!
Masstone is a reddish brown, high chroma. It's tint's are classic burnt sienna fleshy hues, warm and pinky. Used transparently it has glowing mahogany/orange hues.
It paints long. Lovely paint to use, feels and looks very high quality.
Technical Overview
Pigment - PBr7
Binder - Linseed Oil
Opacity - Semi-Transparent
Tinting Strength - Good