what color is umber
umber is a natural brown or reddish brown earth pigment that contains iron oxide and manganese oxide it is darker than the other similar earth pigments ochre and sienna in its natural form it is called raw umberwhen heated calcinated the color becomes more intense and the color is known as burnt umberhe color of the natural earth depends upon the amount of iron oxide and manganese in the clay umber earth pigments contain between five and twenty percent manganese oxide which accounts for their being a darker color than yellow ochre or sienna