Rublev Colours French Raw Umber is a semi-transparent, deep greenish brown with good tint strength, fine grained and, like most Rublev Colours Artist Oils, brushes "long" in the direction of the brush stroke. Our French umber is a single pigment color made of natural hydrated iron-manganese oxide mineral from the last remaining European company operating the ocher deposits in the French quarries of Gargas and Rustrel nestled in a 12 mile long enclave in the heart of the Luberon Massif, the ocher country.