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.
Pigment Classification: Inorganic Color Index Name: PBr7 Color Index Number: 77492 Chemical Description: Natural Iron Oxide containing Manganese Opacity/Transparency: Opaque Lightfastness Rating: 1 Permanency: Excellent Munsell Notation Listing: N/A Gloss Average: N/A Viscosity Range: 75-100 CPS CIE L*a*b* Values: N/A Tint Strength: N/A