Indigo

:This article is about the color. For other meanings, see Indigo (disambiguation).

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Indigo is the color of light between 440 to 420 nanometres in wavelength, placing it between blue and violet. Like many other colors (orange and violet are the most well-known), it gets its name from an object in the natural world - the plant named indigo once used for dyeing cloth.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Indigo cannot be reproduced on a computer screen. You can see the color by looking at the reflection of a fluorescent tube in a compact disc.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Indigo is neither an additive primary color nor a subtractive primary color. It was named and defined by Isaac Newton when he divided up the optical spectrum (which is a continuum of frequencies). He named seven colors specifically to link them with the (known) planets, days of the week, notes in the octave, and other lists that had seven items.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

The human eye is relatively insensitive to indigo's frequencies, and some otherwise well-sighted people cannot distinguish indigo from blue and violet. For this reason some commentators including Isaac Asimov have suggested that indigo should not be regarded as a color in its own right but merely as a shade of blue or violet.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Light: Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific setting, electromagnetic radiation of any wavelength. The three basic dimensions of light (i.e., all electromagnetic radiation) are:...

Nanometre: A nanometre (American spelling: nanometer; symbol nm) (Greek: ?????, nanos, "dwarf"; ??????, metr?n, "unit of measurement") is a unit of length in the metric system, equal to one billionth of a meter....

Wavelength: :For the album by Van Morrison, see Wavelength (album)....

Indigo related Images and Photos (experimental)

Indigo	Indigo Bunting	Indigo Apples II	Hank Crawford - Indigo Blue
Hank Crawford - Indigo Blue	Pokemon Season 1: Indigo League Part 3	Pokemon Season 1: Indigo League Part 1	Pokemon Season 1: Indigo League Part 2
Green Lantern Indigo Lantern Symbol T-Shirt	Indigo Lantern 1:4 Scale Power Battery and Ring Prop Replica	Green Lantern Indigo Lantern Compassion T-Shirt	Close-Up of Male Indigo Bunting Feathers Passerina Cyanea North America