Natural Iron-Oxide is the basis for this single-pigment color, named after the region in Italy where it was first mined. Raw Sienna retains more of its yellowish color because is created prior to the heating process that creates "burnt" sienna. (Series 1)
Pigment Classification: Inorganic
Color Index Name: PY43
Color Index Number: 77492
Chemical Description: Natural Hydrated Iron Oxide
Opacity/Transparency: Semi-Transparent
Lightfastness Rating: 1
Permanency: Excellent
Munsell Notation Listing: Hue 9.0 Y Value 4. Chroma 6.6
Gloss Average: 27.98
Viscosity Range: 750-1000 CPS
CIE L*a*b* Values: L*88.09 a*4.82 b*12.73
Tint Strength: 88.08