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Clay earth pigments are naturally occurring minerals, principally iron oxides, that have been used since prehistoric times as pigments. The primary types are *ochre *sienna *umber Earth pigments are known for their fast drying time in oil painting, relative inexpensiveness, and lightfastness. Cave 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.) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「clay earth pigment」の詳細全文を読む スポンサード リンク
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