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Red bolus - PR102 A reddish-brown, opaque earth tone with good lightfastness, resembling the wellknown red chalk. The pigment comes from deposits in Upper Franconia (Bavaria). Bolus means earth lump and refers to a reddish-coloured clay. Red bolus is one of the oldest pigments, and drawing pencils from red bolus were sawn directly from clay-rich soils in the early Renaissance.
