One of the names of paint colors. Since the Middle Ages, a blue pigment has been made by crushing the natural mineral lapis lazuli. Natural lapis lazuli is found in Central Asia and the Middle East, and was extremely expensive in Europe. In 1824, the French government encouraged the invention of an alternative artificial pigment, and in 1826 J. Guimet, followed by L. Gmelin and others, came up with a synthesis method. The artificial pigment is composed of a double salt of sodium aluminum silicate and sodium sulfide, Na 10 Al 6 Si 6 O 24 , Na 4 S 2 , and has a slightly reddish blue color. With the same composition, it is possible to create paints with slightly different hues depending on the processing method. As an oil paint, it is usually available in light and deep colors. It is transparent and has good covering power, and is weak against acids but stable against alkalis and sulfide gases. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
絵具の色名の一つ。中世頃から,天然鉱石のラピス・ラズリを粉砕してつくった青色顔料。天然のものは中央アジア,中近東に産し,ヨーロッパではきわめて高価であった。 1824年フランス政府はこれに代る人工顔料の発明を奨励し,26年 J.ギメーが,続いて L.グメリンらが合成法を案出した。人工のものの組成はケイ酸アルミニウムナトリウムと硫化ナトリウムの複塩 Na10Al6Si6O24・Na4S2 で,やや赤みを感じる青色を呈する。同じ組成でも処理法によって色相のやや異なるものもつくりうる。油絵具としては普通ライトとディープがある。透明性も被覆力もあり,酸には弱いがアルカリや硫化ガスに対しては安定している。
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