Burnt Sienna: Natural calcined (roasted) earth pigment. More opaque today than 200 years ago. For greater transparency, consider Gamblin Transparent Earth Colors and Van Dyke Brown.

Pigment: Calcined natural iron oxide (PBr 7)
Vehicle: Alkali refined linseed oil
Lightfastness I, Series 1, SEMI-TRANSPARENT
Color Temperature: Warm
SDS

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