ocher (redirected from Ocher (disambiguation))

ocher (ō`kər), mixture of varying proportions of iron oxide and clay, used as a pigment. It occurs naturally as yellow ocher (yellow or yellow-brown in color), the iron oxide being limonite, or as red ocher, the iron oxide being hematite. Ocher grades into sienna, a yellow-brown pigment containing a higher percentage of iron ore than ocher as well as some manganese dioxide; sienna grades into umber, which is darker brown and contains a higher percentage of manganese dioxide. Burnt sienna is brown or bright red; burnt umber is a darker brown than umber. Ocher is produced in the United States, in France (French ocher being of a very high grade), and in some other parts of Europe. Italy is a leading producer of sienna and umber, and Cyprus of umber.

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ochre (US), ocher

a. a moderate yellow-orange to orange colour

b. (as adjective): an ochre dress

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ocher [′ō·kər]

(mineralogy)

A yellow, brown, or red earthy iron oxide, or any similar earthy, pulverulent metallic oxides used as pigments.