Indigo

Indigo is a shade of blue, more specifically, purplish blue or dark blue.  

Isaac Newton named and defined indigo as a spectrum color when he divided up the spectrum into the seven colors of the rainbow.  The spectral range of indigo is between 450 and 420 nanometers.  

The name of the color indigo originally came from the indigo plant. Indigo is a dye made from the indigo plant, used to dye cloth. Indigo dye also is used to dye denim cloth, which is used to make what are called blue jeans (they should really be called indigo jeans). This shade of indigo is called indigo dye.

The indigo plant originally came from the nation of India. The Ancient Greek language word for the dye is indikon. The Romans used the term indicum, which passed into Italian dialect and eventually into English as the word indigo. 

These things are colored indigo:
 some grapes
 night sky in the mid-evening
 blueberries
 some small clams
 some eggplants
 Jenna Rose's jeans

Meaning of indigo
 Indigo represents religion, spirituality, sorcery and intuition. Graham, Lanier F. (editor) The Rainbow Book Berkeley, California: 1976 Shambala Publishing and The Fine Arts Museums of San Francisco  (Handbook for the Summer 1976 exhibition The Rainbow Art Show which took place primarily at the De Young Museum but also at other museums) Indigo Pages 152–153 The color indigo is stated to represent intuition.  

 In the Hindu religion, indigo represents the sixth chakra. 

 Indigo was also the name of a character from the famous toy line, Rainbow Brite.

Comparison of blue, indigo, violet and purple
NameColorHEX CodeRedGreenBlueHueSatLumBlue#0000FF00255240°100%100%Indigo (Electric Indigo)#6F00FF1110255266°100%100%Violet (Color Wheel) (Near Violet)#7F00FF1270255270°100%100%Violet (Electric Violet) (Middle Violet) (Blue Purple)#8F00FF1430255274°100%100%Vivid Violet (Extreme Violet)#9F00FF1590255277°100%100%Purple#8000801280128300°100%50%

Tones of indigo color comparison chart
 Light Lavender Mist (Xona.com Color List "Lavender Light ") (Hex: #F5F5FD) (RGB: 245, 245, 253) Lavender Mist (web color Lavender) (Hex: #E6E6FA) (RGB: 230, 230, 250) Light Melrose (Melrose Light (Xona.com color list)) (Hex: #E7E4EF) (RGB: 231, 228, 255) Light Logan (Logan Light (Xona.com color list)) (Hex: #D9D8EA) (RGB: 217, 216, 234) Light Periwinkle (Periwinkle (Crayola)) (Hex: #C5D0E6) (RGB: 197, 208, 230) Periwinkle (Lavender Blue) (PerBang.dk) (Maerz and Paul) (Hex: #CCCCFF) (RGB: 204, 204, 255) Melrose (Xona.com color list) (Hex: #C7C1FF) (RGB: 199, 193, 255) Light Chetwode Blue (Chetwode Blue Light (Xona.com color list)) (Hex: #C5C2EF) (RGB: 197, 194, 239) Light Moody Blue (Moody Blue Light (Xona.com color list)) (Hex: #C1BBEC) (RGB: 193, 187, 236) Light Steel Blue (web color) (Hex: #B0C4DE) (RGB: 176, 196, 222) Panama Blue (Pale Indigo) (Plochere) (Hex: #B3BCE2) (RGB: 179, 188, 226) Maximum Blue Purple (Hex: #ACACE6) (RGB: 172, 172, 230) Logan (Xona.com color list) (Hex: #AAA9CD) (RGB: 170, 169, 205) Rich Periwinkle (Hex: #9999FF) (RGB: 153, 153, 255) Deep Periwinkle (Hex: #8080FF) (RGB: 128, 128, 255) Chetwode Blue (Xona.com color list) (Hex: #8581D9) (RGB: 133, 129, 217) Moody Blue (Xona.com color list) (Hex: #7F76D3) (RGB: 127, 118, 211) Toolbox (Crayola colored pencils) (Hex: #746CC0) (RGB: 116, 108, 192) Medium Periwinkle (Deep Periwinkle (Pantone TPX 17-3932)) (Hex: #7A83BF) (RGB: 122, 131, 191) Light Blue-Violet (Blue-Violet Light (Xona.com Color List)) (Hex: #C77DF3) (RGB: 199, 125, 243) Medium Slate Blue (web color) (Hex: #7B68EE) (RGB: 123, 104, 238) Slate Blue (web color) (Hex: #6A5ACD) (RGB: 106, 90, 205) Majorelle Blue (Hex: #6050DC) (RGB: 96, 80, 220) Light Indigo (Indigo Light (Xona.com Color List)) (Hex: #4081A4) (RGB: 64, 129, 164) Steel Blue (web color) (Hex: #4682B4) (RGB: 70, 130, 180) Bright Indigo (Indigo (Crayola)) (Hex: #5D76CB) (RGB: 93, 118, 203) Medium Indigo (Indigo aclarado (Gallego & Sanz)) (Hex: #3B708D) (RGB: 59, 112, 141) Light Gulf Blue (Gulf Blue Light (Xona.com Color List)) (Hex: #3560A6) (RGB: 53, 96, 166) Denim (Crayola) (Hex: #1560BD) (RGB: 21, 96, 189) Han Blue (PerBang.dk) (Hex: #5218FA) (RGB: 82, 24, 250) Electric Ultramarine (Ultramarine (Maerz and Paul)) (Hex: #3F00FF) (RGB: 63, 0, 255) Westminster (Maerz and Paul) (Hex: #5F00FF) (RGB: 95, 0, 255) Lobelia (Near Indigo) (Maerz and Paul) (Hex: #6700FF) (RGB: 103, 0, 255) INDIGO (Electric Indigo) (Middle Indigo) (Hex: #6F00FF) (RGB: 111, 0, 255) Pansy (Extreme Indigo) (Maerz and Paul) (Hex: #7700FF) (RGB: 119, 0, 255) French Indigo (Indigo (pourpre.com)) (Vivid Indigo) (Hex: #791CF8) (RGB: 121, 28, 248) Lavender Indigo (www.99colors.net) (Hex: #9457EB) (RGB: 148, 87, 235) Deep Indigo (Blue-Violet (web color)) (Hex: #8A2BE2) (RGB: 138, 43, 226) Royal Purple (Crayola) (Hex: #6B3FA0) (RGB: 107, 63,160) Vintage  Indigo (Pantone TPX 19-3929) (Hex: #664D64) (RGB: 102, 77, 100) Indigo (Pantone) (Pantone TPX 19-3215) (Hex: #503E5C) (RGB: 80, 62, 92) Dotcom (Resene color list) (Hex: #41415D) (RGB: 65, 65, 93) Pigment Indigo (Indigo (web color)) (Hex: #4B0082) (RGB: 75, 0, 130) Dark Slate Blue (web color) (Hex: #483D8B) (RGB: 72, 61, 139) Persian Indigo (Regimental) (Maerz and Paul) (Hex: #32127A) (RGB: 50, 18, 122) Pictorial  Indigo (Indigo pictorico (Gallego & Sanz)) (Hex: #213C6E) (RGB: 33, 60, 110) Blue Indigo (Pantone TPX 19-3928) (Hex: #485470) (RGB: 72, 84, 112) Dark Imperial Blue (Imperial Blue (ISCC-NBS)) (Hex: #00416A) (RGB: 0, 65, 106) Indigo Dye (Anil (Gallego & Samz)) (Hex: #091F92) (RGB: 9, 31, 146) Spanish Indigo (Indigo Especifico (Gallego & Samz)) (Hex: #003C92) (RGB: 0, 60, 148) Imperial Blue (Vexillological) (Maerz and Paul) (Hex: #002395) (RGB: 0, 35, 149) Ultramarine (Pigment) (www.99colors.net) (Hex: #120A8F) (RGB: 18, 10, 143) Midnight Blue (web color) (Hex: #191970) (RGB: 25, 25, 112) Dark Midnight Blue (Midnight Blue (Crayola)) (Hex: #003366) (RGB: 0, 51, 102) Prussian Blue (Berlin Blue) (www.99colors.net) (Hex: #003153) (RGB: 0, 49, 83) Dark Indigo (www.99colors.net) (Hex: #310062) (RGB: 49, 0, 98) Gulf Blue (Xona.com color list) (Hex: #051657) (RGB: 9, 22, 87) Japanese Indigo  (Japanese traditional colors) (Hex: #264348) (RGB: 38, 67, 72)

Related pages
List of colors
Navy blue
Prussian blue

References