Derivan Matisse Fluid Acrylic: Burnt Sienna 135ml

• Chemical Description: Synthetic and natural iron oxide

• Pigment Numbers: PBr7 PR101

• Lightfastness Rating: ASTM I

• Pigment Opacity: Transparent

• Paint Opacity: Semi-Transparent

• Series 1

To make the Burnt Sienna color, Raw Sienna is slowly roasted in kilns. The iron oxide in the Raw Sienna is in the form of a hydroxide and the roasting process drives the water from the molecular structure until only oxides remain. The production of the pigment is an art as much as a science. By varying the temperature and time in the ovens the skilled pigment maker is able to make a wide range of colours from the light orange shades of the so-called half-burnt Sienna to the rich reddish to reddish-orange browns of the true Burnt Sienna colour that artists prefer.