Umber is essentially clay, and this variation on the PBr7 pigment is the lighter (un-burnt) version of this classic earth tone that originated in the Umbria region of Italy. (Series 1)
Pigment Classification: Inorganic
Color Index Name: PBr 7
Color Index Number: 77492
Chemical Description: Natural Iron Oxide containing Manganese
Opacity/Transparency: Semi-Opaque
Lightfastness Rating: I
Permanency: Excellent
Munsell Notation Listing: Hue 3.0 Y Value 2.5 Chroma 1.3
Gloss Average: 16.59
Viscosity Range: 400-1000 CPS
CIE L*a*b* Values: L*29.25 a*1.04 b*2.67
Tint Strength: 76.39
