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Indigo is a color that is traditionally regarded as a color on the visible spectrum, as well as one of the seven colors of the rainbow: the color between blue and violet. Although traditionally considered one of seven major spectral colors, sources differ as to its actual position in the electromagnetic spectrum. Indigo is a deep and bright color close to the color wheel blue (a primary color in the RGB color space), as well as to some variants of ultramarine. The color indigo was named after the indigo dye derived from the plant ''Indigofera tinctoria'' and related species. The first known recorded use of indigo as a color name in English was in 1289.〔Maerz and Paul ''A Dictionary of Color'' New York:1930 McGraw-Hill Page 197; Color Sample of Indigo: Page 117 Plate 47 Color Sample E10〕 ==History== India is believed to be the oldest center of indigo dyeing in the Old World. It was a primary supplier of indigo dye, derived from the plant ''Indigofera tinctoria'', to Europe as early as the Greco-Roman era. The association of India with indigo is reflected in the Greek word for the 'dye', which was ''indikon'' (ινδικόν). The Romans used the term ''indicum'', which passed into Italian dialect and eventually into English as the word indigo. El Salvador has lately been the biggest producer of indigo. The same indigo dye is contained in the woad plant, ''Isatis tinctoria'', for a long time the main source of blue dye in Europe. Woad was replaced by true indigo as trade routes opened up, and both are now largely replaced by synthetic dyes. Though the word indigo has existed in English since the 13th century, it may never have been a common part of the basic color-naming system. 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「Indigo」の詳細全文を読む スポンサード リンク
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