Michael Harding Raw Sienna is powerful to use as a ground tone and for underpainting. Its origins date back to the 17th century, this is one of the indispensable Earth Iron Oxides! As the name suggests, the best grades come from central Italy, where Michael Harding derive his own supply.
| Color Index | PBr7 |
| Drying Speed | Fast |
| Transparency | Semi-Transparent |
| Lightfastness | Excellent |
| Oil Content | Average |
| Tint Power | Average |
| Toxicity | Non-Toxic |
| ASTM D-4236 | ✓ |