Information AboutIndigo |
| CATEGORIES ABOUT INDIGO | |
| optical spectrum | |
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Indigo is the Color on the Spectrum between about 450 and 420 Nm in Wavelength , placing it between Blue and Violet . Color scientists do not usually recognize indigo as a significant color category, and generally classify wavelengths shorter than about 450 nm as violet.1 Indigo and violet are different from Purple , which cannot be seen on the electromagnetic spectrum but can be achieved by mixing Blue light with Red light. One can see spectral indigo by looking at the reflection of a fluorescent tube in a non-recordable Compact Disc . This works because the CD functions as a Diffraction Grating , and a Fluorescent Lamp generally has a peak at 435.833 nm (from Mercury ), as is visible on the Fluorescent Lamp Spectrum . DISTINCTION BETWEEN FOUR SHADES OF INDIGO Like many other colors ( Orange and Violet are the best-known), indigo gets its name from an object in the natural world—the plant named '' Indigo '' once used for dyeing cloth (see also Indigo Dye ). The color ''electric indigo'' is an approximation of ''spectrum indigo''. This is the brightest color indigo that can be approximated on a computer screen—it is the color between the Web Color Blue and the color electric Violet . The web color ''blue violet'' or ''deep indigo'' is a shade of indigo brighter than pigment indigo but not as bright as electric indigo. The color ''pigment indigo'' is equivalent to the Web Color indigo and approximates the color indigo that is usually reproduced in pigments and colored pencils. The color of ''indigo dye'' is a different color than either spectrum indigo or pigment indigo. This is the actual color of the dye from the indigo plant when switched onto raw fabric. A vat full of this dye is a darker color, approximating the web color Midnight Blue . When specifying the color ''indigo'', it is necessary to indicate which particular one of these four major shades of indigo you are referring to. Electric indigo
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