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Recognised as Colour

#213F56

  • #213F56
  • Blue
  • Dark
  • Nearest: Dark slate grey

#213F56 is a blue with RGB values 33, 63, 86 and HSL 206°, 45%, 23%. It is a dark colour, so white text on it reaches 11:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#213F56#213F56
HEX#213F56
RGBrgb(33, 63, 86)
RGB (0–1)0.1294, 0.2471, 0.3373
RGB percentages12.9%, 24.7%, 33.7%
HSLhsl(206, 44.5%, 23.3%)
HSV / HSBhsv(206, 61.6%, 33.7%)
CMYK61.6%, 26.7%, 0%, 66.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,178,902
CSS custom property--colour: #213F56;

Brightness & contrast

Relative luminance0.0455WCAG 2.x, 0 is black and 1 is white
Perceived brightness59.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.99:1
Contrast with white10.99:1WCAG normal text: AAA
Contrast with black1.91:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#DEC0A9

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#353F57no red cones; affects about 1% of men; ΔE 6.4 from the original
Deuteranopia#2E3A56no green cones; the most common form, about 1% of men; ΔE 7.1 from the original
Tritanopia#004547no blue cones; rare, and affects men and women equally; ΔE 18 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.99:1WCAG large text: AAA
Contrast with black, large text1.91:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 16.9Dim grey · ΔE 25.8Slate grey · ΔE 28.2Black · ΔE 30.9Steel blue · ΔE 30.9Light slate grey · ΔE 31.1
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 16.89, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#563821
Analogous#215652, #212456
Triadic#56213F, #3F5621
Split complementary#562124, #565221
Tetradic#532156, #563821, #245621

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#78A7CB
Lighter +30%#538FBD
Lighter +20%#3D75A0
Lighter +10%#2F5A7B
Darker −10%#132431
Darker −20%#05090C
Darker −30%#000000
Darker −40%#000000
More saturated +25%#124165
Less saturated −25%#303D47

Channel breakdown

R33
G63
B86
Red33 (12.9%)
Green63 (24.7%)
Blue86 (33.7%)
Hue206.04°
Saturation (HSL)44.54%
Lightness23.33%
Dominant channelBlue
Hex per channelR 21 · G 3F · B 56

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Every value on this page was computed from “213f56” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.