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Color Identification of Iron Oxides and Hydroxysulfates

Use and Limitations

A.C. Scheinost^,a and U. Schwertmann^a

^a Lehrstuhl für Bodenkunde, TU München-Weihenstephan, 85350 Freising, Germany

View larger version (25K): [in a new window]   Fig. 1 Color designation in the CIE-Yxy system. Colors lie within the solid lines resembling a shoe sole. Colors within that plane may be given either by the Cartesian coordinates x and y, or by the dominant wavelength, d (nm), and the excitation purity, Pe. The lightness, Y, is normal to the plane

View larger version (17K): [in a new window]   Fig. 2 Color designation in the CIE-L*a*b* system. A plane may be defined either (A) by a* and b* in Cartesian notation or (B) by chroma (C*) and hue (H°) in polar coordinates. The lightness axis, L*, is normal to the plane

View larger version (24K): [in a new window]   Fig. 3 Munsell coordinates of Fe oxides and hydroxysulfates

View larger version (19K): [in a new window]   Fig. 4 Munsell coordinates of soils

View larger version (21K): [in a new window]   Fig. 5 Hue of hematitic soils as a function of the relative hematite content