Encycolorpedia

#c3c9c9 Hex-Farbcode

#c3c9c9 Paint ChipDer hexadezimale Farbcode #c3c9c9 ist ein hell Farbton von Cyan. Im RGB-Farbmodell enthält #c3c9c9 76.47% Rot, 78.82% Grün und 78.82% Blau. Im HSL-Farbraum hat #c3c9c9 einen Farbtonwinkel von 180° (Grad), 5% Sättigung und 78% Helligkeit. Diese Farbe hat eine ungefähre Wellenlänge von 491.41 nm.

Farbvariationen

Benannte Farben

Farbschemas

Herunterladen: GIMP GPL Adobe ASE (Adobe Swatch Exchange) Sketch Palette

Farbtöne und Schattierungen

#c3c9c9 nach Schwarz

  1. #c3c9c9
  2. #9fa4a4
  3. #7d8181
  4. #5d5f5f
  5. #3e4040
  6. #222323
  7. #000000

Farben

Ähnliche Farben

  1. Earthpaint

    1. ★ 5-35-2 Foggy Day
      #c4cacb
      ΔE = 0.644 / LRV ≈ 58.3%
    2. ★ 5-33-2 Pearl Inlay
      #c1cdcc
      ΔE = 2.245 / LRV ≈ 59.4%
  2. Coronado Paint

    1. ★ 8258 - Where There Is Smoke
      #c5c9ca
      ΔE = 0.871 / LRV ≈ 57.9%
    2. 8339 - Dancing Bubbles
      #c3ccc7
      ΔE = 2.813 / LRV ≈ 58.9%
  3. Tamiya

    1. ★ Tamiya 80011,X11
      #c2c7c8
      ΔE = 0.879 / LRV ≈ 56.5%
    2. ★ Tamiya 86512, AS12
      #c2c7ca
      ΔE = 1.693 / LRV ≈ 56.6%
  4. Sigma

    1. ★ Cool Blue / FS201
      #c0c7c8
      ΔE = 0.978 / LRV ≈ 56.2%
    2. Cool Blue / S 2002-B
      #cad1d2
      ΔE = 2.891 / LRV ≈ 62.8%
  5. PPG Pittsburgh Paints

    1. ★ Mcclellanville Chs-51
      #c3cbcc
      ΔE = 1.010 / LRV ≈ 58.7%
    2. Ghost Whisperer / PPG1039-1
      #cbd1d0
      ΔE = 2.898 / LRV ≈ 62.9%
  6. Audi

    1. ★ Felgensilber Metallic / L1H7
      #c4c7c7
      ΔE = 1.104 / LRV ≈ 56.7%
    2. ★ Suzuka Gray Metallic / LY7F, M1M1, M1PA, Y7F
      #c0c6c8
      ΔE = 1.459 / LRV ≈ 55.8%
  7. BYD Auto

    1. ★ Shine White Solid / W-20
      #c1cac9
      ΔE = 1.121 / LRV ≈ 57.8%
  8. Opaltone / OMS

    1. ★ 5343
      #bfc8c8
      ΔE = 1.143 / LRV ≈ 56.6%
  9. Chrysler

    1. ★ Skyline Gray
      #c1c9c7
      ΔE = 1.240 / LRV ≈ 57.2%
    2. ★ Burnished Silver
      #c8c8c8
      ΔE = 1.983 / LRV ≈ 57.8%
  10. TRUMATCH

    1. ★ 25-g4
      #c4cccd
      ΔE = 1.257 / LRV ≈ 59.3%
    2. 21-g5
      #bdc2c1
      ΔE = 2.560 / LRV ≈ 53.3%
  11. Magnolia Home

    1. ★ Cement Pots / JG-93
      #c0caca
      ΔE = 1.305 / LRV ≈ 57.7%
    2. ★ Loft / JG-83
      #c1c5c5
      ΔE = 1.452 / LRV ≈ 55.3%
  12. Color Truck Guide

    1. ★ Ce-Sa002.03
      #c6cac8
      ΔE = 1.309 / LRV ≈ 58.4%
    2. Ce-Sa003.02
      #caceca
      ΔE = 2.834 / LRV ≈ 61.0%
  13. Dutch Boy

    1. ★ Pale Blue Spring
      #bec7c7
      ΔE = 1.366 / LRV ≈ 55.9%
    2. ★ Platinum Band
      #c0c4c6
      ΔE = 2.038 / LRV ≈ 54.8%
  14. 1829

    1. ★ Chromium
      #c6c8c9
      ΔE = 1.442 / LRV ≈ 57.5%
    2. Study Room Blue
      #c9d0ce
      ΔE = 2.622 / LRV ≈ 62.0%
  15. ICI Paints

    1. ★ Silver Quill 30GG 61/010
      #c6c9c7
      ΔE = 1.450 / LRV ≈ 57.9%
    2. ★ Silvery Moonlight 50BG 63/014
      #cacdcc
      ΔE = 1.985 / LRV ≈ 60.6%
  16. Olympic

    1. ★ Cold Steel D63-2
      #c6cdcc
      ΔE = 1.473 / LRV ≈ 60.0%
    2. ★ Secret Passage D58-2
      #c3c5c6
      ΔE = 1.824 / LRV ≈ 55.6%
  17. KILZ

    1. ★ White Gold / H781
      #bfc6c4
      ΔE = 1.626 / LRV ≈ 55.4%
    2. Platinum Ring / H771
      #bec3c6
      ΔE = 2.574 / LRV ≈ 54.1%
  18. Resene

    1. ★ Triple Athens Grey N82-004-244
      #c2c5c6
      ΔE = 1.647 / LRV ≈ 55.5%
    2. ★ Iron N86-002-236
      #cbcdcd
      ΔE = 2.186 / LRV ≈ 60.8%
  19. Johnstone's Paint

    1. ★ Dove Grey
      #c4c8c5
      ΔE = 1.707 / LRV ≈ 57.1%
    2. Moonlit Sky
      #c7c7ca
      ΔE = 2.635 / LRV ≈ 57.3%
  20. Federal Standard

    1. ★ Federal Standard 16515
      #c7c9c7
      ΔE = 1.717 / LRV ≈ 58.0%
    2. Federal Standard 26493
      #c1c2c1
      ΔE = 2.796 / LRV ≈ 53.8%
  21. Pratt & Lambert

    1. ★ Hearthstone 28-27
      #c5c7c5
      ΔE = 1.764 / LRV ≈ 56.7%
    2. Pavanne 25-26
      #c3ccc8
      ΔE = 2.382 / LRV ≈ 59.0%
  22. Australian Standard AS2700

    1. ★ N24 Silver Grey
      #bdc7c6
      ΔE = 1.764 / LRV ≈ 55.7%
    2. N23 Neutral Grey
      #cccccc
      ΔE = 2.506 / LRV ≈ 60.4%
  23. Caparol

    1. ★ 32S 4 / Oxidschwarz 32S 4
      #c0c4c4
      ΔE = 1.783 / LRV ≈ 54.7%
    2. 1802-Y32R
      #cccccc
      ΔE = 2.506 / LRV ≈ 60.4%
  24. Zoffany

    1. ★ Flint Grey
      #c0c5c3
      ΔE = 1.789 / LRV ≈ 55.1%
    2. Frost
      #c2ced1
      ΔE = 2.802 / LRV ≈ 60.2%
  25. Graham & Brown

    1. ★ Taylor's Grey
      #c0c4c3
      ΔE = 1.880 / LRV ≈ 54.6%
  26. Rodda Paint

    1. ★ Where There Is Smoke 8258
      #c9cece
      ΔE = 1.906 / LRV ≈ 61.0%
    2. Quiet Cove 8338
      #bdc8c4
      ΔE = 2.759 / LRV ≈ 56.1%
  27. Cloverdale Paint

    1. ★ Where There Is Smoke / 8258
      #c9cece
      ΔE = 1.906 / LRV ≈ 61.0%
    2. Quiet Cove / 8338
      #bdc8c4
      ΔE = 2.759 / LRV ≈ 56.1%
  28. Ford

    1. ★ Light TItanium
      #c9cece
      ΔE = 1.906 / LRV ≈ 61.0%
    2. Silver
      #cccccc
      ΔE = 2.506 / LRV ≈ 60.4%
  29. Kelly-Moore

    1. ★ Dancing Bubbles / KM3850-1
      #c5cecd
      ΔE = 1.907 / LRV ≈ 60.4%
    2. ★ Where There is Smoke / KM3787-1
      #c7cccf
      ΔE = 2.013 / LRV ≈ 59.8%
  30. Devoe Paint

    1. ★ French Silver / 90BG 55/051
      #bec4c3
      ΔE = 1.908 / LRV ≈ 54.4%
    2. ★ Faded Denim / 10BB 55/065
      #bdc4c6
      ΔE = 2.121 / LRV ≈ 54.4%
  31. Tikkurila

    1. ★ H499
      #c9ccca
      ΔE = 1.910 / LRV ≈ 59.9%
    2. ★ 2115
      #cacac9
      ΔE = 2.235 / LRV ≈ 59.0%
  32. Ferrari

    1. ★ Bianco / 666039
      #bdc4c4
      ΔE = 1.915 / LRV ≈ 54.3%
    2. ★ Bianco Danimarca / 666080
      #c1c8c4
      ΔE = 2.136 / LRV ≈ 56.6%
  33. Jotun

    1. ★ 5105 / Disig
      #bcc6c7
      ΔE = 1.942 / LRV ≈ 55.2%
    2. 5342 / Frostet Glass
      #bec2c0
      ΔE = 2.730 / LRV ≈ 53.3%
  34. General Paint

    1. ★ Cavern / CL 3077N
      #bdc8ca
      ΔE = 2.004 / LRV ≈ 56.4%
    2. Prairie Dust / CL 3122W
      #bbc4c8
      ΔE = 2.943 / LRV ≈ 54.2%
  35. Little Greene

    1. ★ Gauze Dark
      #c7cccf
      ΔE = 2.013 / LRV ≈ 59.8%
  36. Testors

    1. ★ Testors 1290
      #cacccd
      ΔE = 2.016 / LRV ≈ 60.1%
  37. Great Wall

    1. ★ Ivory White Solid / 98
      #c0cac7
      ΔE = 2.024 / LRV ≈ 57.6%
  38. Peintures MF

    1. ★ Camée anglais
      #bcc7c6
      ΔE = 2.059 / LRV ≈ 55.6%
    2. Dollar d'argent
      #bcc4c8
      ΔE = 2.814 / LRV ≈ 54.3%
  39. Farrow & Ball

    1. ★ Skylight / 205
      #c4c9c5
      ΔE = 2.071 / LRV ≈ 57.5%
  40. California Paints

    1. ★ DE 6374 - Silver Polish
      #c6c6c6
      ΔE = 2.079 / LRV ≈ 56.5%
    2. Bauhaus
      #bec2c1
      ΔE = 2.551 / LRV ≈ 53.4%
  41. Dunn-Edwards

    1. ★ Silver Polish / 1417
      #c6c6c6
      ΔE = 2.079 / LRV ≈ 56.5%
    2. ★ Foil / 1323
      #c0c3c4
      ΔE = 2.229 / LRV ≈ 54.2%
  42. Games Workshop - Citadel

    1. ★ Runefang Steel (Metal)
      #c3cace
      ΔE = 2.085 / LRV ≈ 58.3%
    2. Stormhost Silver (Metal)
      #bbc6c9
      ΔE = 2.583 / LRV ≈ 55.2%
  43. Clark+Kensington

    1. ★ So Sophisticated / N-C17
      #c4c9cd
      ΔE = 2.099 / LRV ≈ 57.9%
    2. Garden Stone / N-C10
      #cacbc8
      ΔE = 2.524 / LRV ≈ 59.4%
  44. Brillux

    1. ★ 66.03.12
      #bcc6c8
      ΔE = 2.102 / LRV ≈ 55.2%
    2. 75.06.12
      #bac5c2
      ΔE = 2.957 / LRV ≈ 54.3%
  45. Brighto Paints

    1. ★ 7109 Moonshade
      #c9cac8
      ΔE = 2.103 / LRV ≈ 58.8%
    2. 5-29-2 Night Sail
      #c2cbc6
      ΔE = 2.744 / LRV ≈ 58.3%
  46. Talbot

    1. ★ Blanc Courreges Satine / 8838
      #c9cac8
      ΔE = 2.103 / LRV ≈ 58.8%
  47. Sico

    1. ★ 6210-31 Enchanted Flute
      #bec3c3
      ΔE = 2.122 / LRV ≈ 53.9%
  48. Crown Diamond

    1. ★ 7406-31 Enchanted Flute
      #bec3c3
      ΔE = 2.122 / LRV ≈ 53.9%
    2. ★ 7407-21 Stainless Steel
      #caccce
      ΔE = 2.248 / LRV ≈ 60.2%
  49. Opulence

    1. ★ Sensual Silver
      #c8cbce
      ΔE = 2.145 / LRV ≈ 59.4%
  50. British Standard

    1. ★ BS 4800 18 B 17 - Blue mink / Silver haze / Heron
      #c4cdca
      ΔE = 2.147 / LRV ≈ 59.7%
  51. Model Master

    1. ★ Model Master 1728
      #c9cacc
      ΔE = 2.169 / LRV ≈ 59.0%
  52. Humbrol

    1. ★ 147 Light Grey
      #c9cacc
      ΔE = 2.169 / LRV ≈ 59.0%
  53. Nippon Paint

    1. ★ Light Pewter / NP N 1998 P
      #bdc3c3
      ΔE = 2.173 / LRV ≈ 53.8%
    2. Graycloth / NP N 1979 P
      #bcc2c2
      ΔE = 2.536 / LRV ≈ 53.2%
  54. Colorhouse

    1. ★ Wool .02
      #c1cdcd
      ΔE = 2.185 / LRV ≈ 59.4%
  55. Dulux

    1. ★ Pebble Thoughts
      #cbcdcc
      ΔE = 2.230 / LRV ≈ 60.7%
    2. Quartz Flint 2
      #c9d1d2
      ΔE = 2.871 / LRV ≈ 62.7%
  56. Sikkens

    1. ★ ON.00.76
      #cacac9
      ΔE = 2.235 / LRV ≈ 59.0%
  57. Levis

    1. ★ Atl Matin E6
      #cbcccb
      ΔE = 2.260 / LRV ≈ 60.2%
    2. Atl Matin E5
      #c5c7c3
      ΔE = 2.527 / LRV ≈ 56.7%
  58. Behr

    1. ★ Cape Mist C40-54
      #bbc6c5
      ΔE = 2.279 / LRV ≈ 55.0%
    2. 8491 Whales Grey
      #bac5c2
      ΔE = 2.957 / LRV ≈ 54.3%
  59. Disney

    1. ★ DE2-3 Galactic Grey
      #bbc7c7
      ΔE = 2.280 / LRV ≈ 55.5%
  60. Dulux Australia

    1. ★ Aluminium / O21
      #cbcdce
      ΔE = 2.282 / LRV ≈ 60.8%
    2. Silver Grey / G24
      #c4c5c1
      ΔE = 2.932 / LRV ≈ 55.5%
  61. Vallejo

    1. Vallejo 70.790 #211
      #bfc4c7
      ΔE = 2.300 / LRV ≈ 54.7%
  62. Sherwin-Williams

    1. Tinsmith - 7657
      #c5c8c4
      ΔE = 2.305 / LRV ≈ 57.2%
    2. Tradewind - 6218
      #c2cfcf
      ΔE = 2.795 / LRV ≈ 60.6%
  63. Kansai Paint

    1. Volcanic Rock
      #bdc7c4
      ΔE = 2.310 / LRV ≈ 55.7%
  64. Diamond Vogel

    1. Sacred Spring / 0510
      #c9cccf
      ΔE = 2.338 / LRV ≈ 60.1%
    2. Country Sky / H040
      #becccc
      ΔE = 2.636 / LRV ≈ 58.5%
  65. Focoltone

    1. 5055
      #c3c5c8
      ΔE = 2.360 / LRV ≈ 55.7%
  66. McCormick Paints

    1. Where there is Smoke
      #caced0
      ΔE = 2.362 / LRV ≈ 61.3%
  67. Asian Paints

    1. Winter Moon / 8258
      #caced0
      ΔE = 2.362 / LRV ≈ 61.3%
    2. Rhinestone / 0740
      #bfc5c0
      ΔE = 2.998 / LRV ≈ 54.8%
  68. Berger

    1. Where there is Smo / 8258
      #caced0
      ΔE = 2.362 / LRV ≈ 61.3%
    2. Grey Mist / 8315
      #bfc5c0
      ΔE = 2.998 / LRV ≈ 54.8%
  69. Scib Paints

    1. Where there is Smo / 8258
      #caced0
      ΔE = 2.362 / LRV ≈ 61.3%
    2. Grey Mist / 8315
      #bfc5c0
      ΔE = 2.998 / LRV ≈ 54.8%
  70. Vista Paint

    1. Where there is Smoke
      #caced0
      ΔE = 2.362 / LRV ≈ 61.3%
    2. Grey Mist
      #bfc5c0
      ΔE = 2.998 / LRV ≈ 54.8%
  71. Pantone / PMS

    1. 14-4504 TCX
      #bcc8c6
      ΔE = 2.390 / LRV ≈ 56.1%
    2. 14-4505 TPG
      #bcc6c2
      ΔE = 2.857 / LRV ≈ 55.0%
  72. Marston & Langinger

    1. Pearl Grey
      #cbcfcf
      ΔE = 2.404 / LRV ≈ 61.8%
  73. Laura Ashley

    1. 42-24 Pigeon
      #cacac8
      ΔE = 2.424 / LRV ≈ 59.0%
  74. Evonik-Degussa

    1. 4241P Stiletto Gray
      #bec4c1
      ΔE = 2.438 / LRV ≈ 54.3%
    2. 4231P Light Pewter
      #bbc3c2
      ΔE = 2.499 / LRV ≈ 53.5%
  75. CIL

    1. Silver Quill
      #cbcecc
      ΔE = 2.443 / LRV ≈ 61.2%
    2. Paddlewheel Grey
      #cad1d2
      ΔE = 2.891 / LRV ≈ 62.8%
  76. Colortrend

    1. 0489
      #bbc6c4
      ΔE = 2.467 / LRV ≈ 54.9%
    2. Tudor Ice
      #bac7c8
      ΔE = 2.615 / LRV ≈ 55.5%
  77. Valspar Paint

    1. Rocky Shelter R216E
      #bec2c2
      ΔE = 2.473 / LRV ≈ 53.4%
    2. Hinkypunk X98R215E
      #bdc3c6
      ΔE = 2.602 / LRV ≈ 53.9%
  78. Duron

    1. Silver Strand
      #c8cdc9
      ΔE = 2.502 / LRV ≈ 60.2%
    2. Gray Screen
      #c9cace
      ΔE = 2.857 / LRV ≈ 59.1%
  79. Beckers

    1. Havstulpan 506 / S 2000-N
      #cccccc
      ΔE = 2.506 / LRV ≈ 60.4%
  80. Natural Color System / NCS

    1. S 2005-B20G
      #bcc3c1
      ΔE = 2.545 / LRV ≈ 53.6%
    2. S 2005-R90B
      #c2c3c6
      ΔE = 2.914 / LRV ≈ 54.6%
  81. Craig & Rose

    1. Mustique
      #c9d0ce
      ΔE = 2.622 / LRV ≈ 62.0%
  82. Toyo Ink

    1. CF10762
      #cccccd
      ΔE = 2.622 / LRV ≈ 60.4%
  83. Taubmans

    1. Ocean Dream / T12 41.B12
      #bbc2c3
      ΔE = 2.655 / LRV ≈ 53.1%
    2. Shaded Grey / T08 133-2
      #bac4c2
      ΔE = 2.742 / LRV ≈ 53.8%
  84. Bristol

    1. Ocean Dream / P228-N3
      #bbc2c3
      ΔE = 2.655 / LRV ≈ 53.1%
    2. Silver Water / P227-N3
      #b9c5c5
      ΔE = 2.727 / LRV ≈ 54.3%
  85. Fired Earth

    1. Modernist White
      #c6c6c3
      ΔE = 2.683 / LRV ≈ 56.3%
  86. Benjamin Moore

    1. Smoke / 2122-40
      #bbc9ca
      ΔE = 2.684 / LRV ≈ 56.6%
    2. Wales Gray / 1585
      #bac6c4
      ΔE = 2.740 / LRV ≈ 54.8%
  87. Glidden

    1. Icy Teal / 50GG 55/049
      #bbc8c6
      ΔE = 2.691 / LRV ≈ 56.0%
    2. Neo-Mediterranean Mist / 30GG 54/045
      #bbc6c3
      ΔE = 2.736 / LRV ≈ 54.9%
  88. Tollens

    1. Gris tourterelle
      #c2c3c1
      ΔE = 2.714 / LRV ≈ 54.3%
    2. T2179-6
      #b9c6c8
      ΔE = 2.905 / LRV ≈ 54.9%
  89. Dupont

    1. CAS898
      #bbc9cb
      ΔE = 2.795 / LRV ≈ 56.6%
  90. Homebase

    1. Silver Mist
      #ccd0d1
      ΔE = 2.828 / LRV ≈ 62.6%
  91. Teknos

    1. 2901 O GREY
      #c7cacf
      ΔE = 2.884 / LRV ≈ 58.9%
  92. Porter Paints

    1. Quest / ATC-64
      #bdc1c3
      ΔE = 2.974 / LRV ≈ 52.9%
    2. Gale Force / ATC-59
      #bec8c3
      ΔE = 2.974 / LRV ≈ 56.2%

#c3c9c9 Beispiele für HTML und CSS

#c3c9c9 Vordergrund

Anfangen ist leicht, Beharren eine Kunst.

<p style="color: #c3c9c9">…</p>

#c3c9c9 Hintergrund

Aus Schaden wird man klug.

<p style="background-color: #c3c9c9">…</p>

#c3c9c9 Textschatten

Taten sagen mehr als Worte.

<p style="text-shadow: 0.1em 0.1em 0.15em #c3c9c9">…</p>

Farbkompositionsdiagramme

Farbräume

Dezimalzahl
12831177
Binär
11000011, 11001001, 11001001
Hexadezimal
#c3c9c9
LRV
≈ 57.6%
Naheste kurze Hexadezimalzahl
#ccc ΔE = 2.662
RGB
rgb(195, 201, 201)
RGBA
rgba(195, 201, 201, 1.0)
RG-Chromatizität
r: 0.327, g: 0.337, b: 0.337
RYB
Rot: 0.765%, Gelb: 0.776%, Blau: 0.788%
Android / android.graphics.Color
-3946039 / 0xffc3c9c9
HSL
hsl(180, 5%, 78%)
HSLA
hsla(180, 5%, 78%, 1.0)
HSV / HSB
Farbton: 180° (180.000), Sättigung: 3% (0.030), Wert: 79% (0.788)
HSP
Farbton: 180.000, Sättigung: 2.985%, wahrgenommene Helligkeit: 78.127%
HSLuv (HUSL)
H: 192.174, S: 5.384, L: 80.512
Cubehelix
H: -188.190, S: 0.056, L: 0.781
TSL
T: -1.489, S: 0.010, L: 0.781
CMYK
Cyan: 3% (0.030), Magenta: 0% (0.000), Gelb: 0% (0.000), Schwarzanteil Key: 21% (0.212)
CMY
Cyan: 24% (0.235), Magenta: 21% (0.212), Gelb: 21% (0.212)
XYZ
X: 53.933, Y: 57.592, Z: 63.522
xyY
x: 0.308, y: 0.329, Y: 57.592
CIELab
L: 80.512, a: -2.054, b: -0.717
CIELuv
L: 80.512, u: -3.352, v: -0.723
CIELCH / LCHab
L: 80.512, C: 2.175, H: 199.244
CIELUV / LCHuv
L: 80.512, C: 3.430, H: 192.174
Hunter-Lab
L: 75.890, a: -5.951, b: 3.495
CIECAM02
J: 73.925, C: 5.321, h: 202.589, Q: 169.397, M: 4.654, s: 16.574, H: 256.835
OSA-UCS
Leichtigkeit: -10.081, Gelb: -0.271, Grün: 0.652
LMS
L: 53.948, M: 60.203, S: 63.413
YCbCr
Y: 187.117, Cb: 128.888, Cr: 125.366
YCgCo
Y: 199.500, Cg: 1.500, Co: 47.250
YDbDr
Y: 199.206, Db: 2.700, Dr: 7.998
YPbPr
Y: 199.722, Pb: 0.690, Pr: -3.000
xvYCC
Y: 187.526, Cb: 128.606, Cr: 125.365
YIQ
Y: 199.206, I: -3.574, Q: -1.269
YUV
Y: 199.206, U: 0.885, V: -3.690
Munsell-Farbsystem
10PB 8/1 ΔE = 1.621
Markenfarbe
Heroku (light) ΔE = 11.221

Zufällige Farben

Rot

Grün

Blau