Clay earth pigments are naturally occurring minerals that have been used since prehistoric times as pigments. A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition a highly ordered atomic structure and specific For the drug referred to as "pigment" see Black tar heroin. The primary types are
Earth pigments are known for their fast drying time in oil painting, relative inexpensiveness, and lightfastness. Ochre or Ocher (pronounced /'əʊkə(r/ from the Greek ὠχρός yellow is a Color, usually described as golden - Yellow For the Italian city see Siena. Sienna is a form of Limonite Clay most famous in the production of oil paint Umber is a natural brown Clay Pigment which contains Iron and Manganese Oxides The color becomes more intense when calcined (heated Oil painting is the process of painting with Pigments that are bound with a medium of Drying oil — especially in early modern Europe Linseed oil Caveman paintings done in sienna still survive today.
External links
- http://www.iconofile.com/search_results.asp?subcatid=29 (Starting link; has multiple pages. This is a commercial site, but it has many excellent descriptions and pictures of these and other related materials. )
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