History The pigment sienna was known and used in its natural form by the ancient Romans. It was mined near Arcidosso (formerly under Sienese control, now in the province of Grosseto) on Monte Amiata in southern Tuscany. It was called terra rossa (red earth), terra gialla (yellow earth), or terra di Siena.
History The pigment sienna was known and used in its natural form by the ancient Romans. It was mined near Arcidosso (formerly under Sienese control, now in the province of Grosseto) on Monte Amiata in southern Tuscany. It was called terra rossa (red earth) terra gialla (yellow earth), or terra di Siena.