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|Section2= |Section3= }} Indanthrone blue, also called indanthrene, is an organic dye made from 2-aminoanthraquinone treated with potassium hydroxide in the presence of a potassium salt. It is a pigment that can be used in the following mediums: acrylic, alkalyd, casein, encaustic, fresco, gouache, linseed oil, tempera, pastel, and watercolor painting. It is used to dye unmordanted cotton and as a pigment in quality paints and enamels. As a food dye, it has E number E130, but it is not approved for use in either the United States or the European Union.〔(Summary of Color Additives for Use in the United States in Foods, Drugs, Cosmetics, and Medical Devices ), Food and Drug Administration〕 〔(Current EU approved additives and their E Numbers ), Food Standards Agency〕 Indanthrene Blue RS was patented in 1901 by Rene Bohn as the first anthraquinone vat dye, one of the dyes with very good fastness to light and washing. ==Properties== It has the appearance of blue needles with metallic luster and melting point of 470-500 °C. It has excellent light fastness, but may bleed in some organic solvents. 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「Indanthrone blue」の詳細全文を読む スポンサード リンク
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