It is considerably lighter than most other versions of burnt sienna. The colour ranges from burnt sienna through to reddish brown. The roofline is colored with blue, burnt sienna and green terra cotta. When heated, it becomes a reddish brown and is called burnt sienna. Burnt sienna contains a large proportion of anhydrous iron oxide. The ground colour of the forewings ranges from burnt sienna through to reddish brown.. In this exhibition he displayed only the highest quality pictures on a burnt sienna canvas. PY-43 indicates natural raw sienna, PR-102 indicates natural burnt sienna. His eyes are burnt sienna, and he's almost invariably clad in a blue-striped sweater.