Sepia (PBr7 PBk9)is a rich black-brown which is an essential in any basic palette. A soft mushroom shade is formed when this colour is diluted. A low staining and lightfast colour, Sepia is ideal for pastoral landscapes and shadows.Raw Umber (PBr7) is a rich dark brown. This inorganic pigment is semi-transparent, medium tinting, and extremely permanent. This colour is ideal for evoking mood or lending depth to a field.