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Roy G. Biv is a mnemonic for the sequence of hues in the visible spectrum and in rainbows: * Red * Orange * Yellow * Green * Blue * Indigo * Violet A rainbow spans a continuous spectrum of colors; the distinct bands are an artifact of human color vision. In Roy G. Biv, the colors are arranged in the order of decreasing wavelengths, with red being 650 nm and violet being about 400 nm. The reverse VIBGYOR is used in many Commonwealth countries. Read on...