<Tr> <Th> Source </Th> <Td> HTML / CSS </Td> </Tr> <Tr> <Td_colspan="2"> B: Normalized to (0--255) (byte) H: Normalized to (0--100) (hundred) </Td> </Tr> <P> Indigo is a deep and rich color close to the color wheel blue (a primary color in the RGB color space), as well as to some variants of ultramarine . It is traditionally regarded as a color in the visible spectrum, as well as one of the seven colors of the rainbow: the color between purple and blue; however, sources differ as to its actual position in the electromagnetic spectrum . </P> <P> The color indigo is named after the indigo dye derived from the plant Indigofera tinctoria and related species . </P>

Is indigo a shade of blue or purple