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Recognised as Colour

#310B04

  • #310B04
  • Red
  • Dark
  • Nearest: Black

#310B04 is a red with RGB values 49, 11, 4 and HSL 9°, 85%, 10%. It is a dark colour, so white text on it reaches 17.8:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#310B04#310B04
HEX#310B04
RGBrgb(49, 11, 4)
RGB (0–1)0.1922, 0.0431, 0.0157
RGB percentages19.2%, 4.3%, 1.6%
HSLhsl(9.3, 84.9%, 10.4%)
HSV / HSBhsv(9.3, 91.8%, 19.2%)
CMYK0%, 77.6%, 91.8%, 80.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,214,084
CSS custom property--colour: #310B04;

Brightness & contrast

Relative luminance0.00901WCAG 2.x, 0 is black and 1 is white
Perceived brightness28.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17.79:1
Contrast with white17.79:1WCAG normal text: AAA
Contrast with black1.18:1WCAG normal text: Fail
Greyscale equivalent#131313
Inverted#CEF4FB

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#161203no red cones; affects about 1% of men; ΔE 20 from the original
Deuteranopia#1F1B03no green cones; the most common form, about 1% of men; ΔE 20.9 from the original
Tritanopia#370309no blue cones; rare, and affects men and women equally; ΔE 7.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text17.79:1WCAG large text: AAA
Contrast with black, large text1.18:1WCAG large text: Fail

Named colours

Black · ΔE 23.2Dark slate grey · ΔE 41Dim grey · ΔE 42.3Saddle brown · ΔE 42.7Maroon · ΔE 43.5Sienna · ΔE 44.6
Nearest named CSS colourBlack (#000000)ΔE 23.2, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#042A31
Analogous#310414, #312104
Triadic#04310B, #0B0431
Split complementary#043122, #041331
Tetradic#143104, #042A31, #210431

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EC3715
Lighter +30%#BE2B10
Lighter +20%#8F200C
Lighter +10%#601608
Darker −10%#020000
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#350800
Less saturated −25%#2A100B

Channel breakdown

R49
G11
B4
Red49 (19.2%)
Green11 (4.3%)
Blue4 (1.6%)
Hue9.33°
Saturation (HSL)84.91%
Lightness10.39%
Dominant channelRed
Hex per channelR 31 · G 0B · B 04

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Every value on this page was computed from “310b04” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.