Rock paint - Iwaenogu

Japanese: 岩絵具 - いわえのぐ

Paints made from naturally occurring minerals. Inorganic pigments. They are powders that do not dissolve in water and are mixed with glue. They retain vivid colors for a long time and are the mainstream of paints in Oriental paintings. The main colors are the deep blue ultramarine (gunjo), which is produced as azurite, the green verdigris (rokusho, malachite), and the red vermilion (cinnabar). There are a limited number of other colors, such as vermilion, yellow ochre, red ochre, white clay, and chalk powder, but these are rarely mixed. In the case of ultramarine and verdigris, bright colors (white ultramarine, white green) can be obtained by crushing them into fine particles. Other paints made artificially from metal compounds are sometimes called new rock paints.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

天然に産する鉱物を原料とする絵具。無機顔料。水に溶解しない粉末で膠水と練り合せて用いる。鮮明な色調を長期間保ち，東洋絵画の絵具の主流。藍銅鉱として産する濃青色の群青 (ぐんじょう) をはじめ，緑色の緑青 (ろくしょう。孔雀石) ，赤色の朱 (辰砂) などがおもなもので，ほかに丹，黄土，岱赭 (たいしゃ) ，白土，胡粉など色数は限られているが，混色されることは少い。群青，緑青などの場合は粉砕して微粒状にすることで明るい色調 (白群，白緑) が得られる。その他金属化合物から人工的に作られるものを新岩絵具と呼ぶことがある。

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