Agent Name

Umber

CAS Number

12713-03-0

Formula

Unspecified

Major Category

Mineral Dusts

Synonyms

Burnt umber; [ChemIDplus] UMBERS; Raw Umbers; Burnt Umbers; [Rockwood Pigments MSDS]

Category

Other Mineral Dusts

Description

Brown to dark brown odorless powder; Insoluble in water; [Rockwood Pigments MSDS]

Sources/Uses

A brown earth pigment containing manganese and iron oxides; [REPROTOX] Permitted for use as an inert ingredient in non-food pesticide products; [EPA] "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 umber. When heated (calcinated), the color becomes more intense, and the color is known as burnt umber." [Wikipedia]

Comments

Composed of 46-65% iron oxide (CAS# 1332-37-2), 5-15% manganese oxide (CAS# 1313-13-9), 2-12% aluminum oxide (CAS# 1344-28-1), and 1-4% silica - quartz (CAS# 14808-60-7); May cause mechanical irritation; [Rockwood Pigments MSDS] See "Iron oxide (Fe2O3)."

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