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Recognised as Colour

#31040A

  • #31040A
  • Red
  • Dark
  • Nearest: Black

#31040A is a red with RGB values 49, 4, 10 and HSL 352°, 85%, 10%. It is a dark colour, so white text on it reaches 18.2:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#31040A#31040A
HEX#31040A
RGBrgb(49, 4, 10)
RGB (0–1)0.1922, 0.0157, 0.0392
RGB percentages19.2%, 1.6%, 3.9%
HSLhsl(352, 84.9%, 10.4%)
HSV / HSBhsv(352, 91.8%, 19.2%)
CMYK0%, 91.8%, 79.6%, 80.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,212,298
CSS custom property--colour: #31040A;

Brightness & contrast

Relative luminance0.00762WCAG 2.x, 0 is black and 1 is white
Perceived brightness27.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 18.22:1
Contrast with white18.22:1WCAG normal text: AAA
Contrast with black1.15:1WCAG normal text: Fail
Greyscale equivalent#0E0E0E
Inverted#CEFBF5

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#100F0Ano red cones; affects about 1% of men; ΔE 23.9 from the original
Deuteranopia#1C1909no green cones; the most common form, about 1% of men; ΔE 24.6 from the original
Tritanopia#370006no blue cones; rare, and affects men and women equally; ΔE 5.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text18.22:1WCAG large text: AAA
Contrast with black, large text1.15:1WCAG large text: Fail

Named colours

Black · ΔE 24.8Dark slate grey · ΔE 43.6Maroon · ΔE 44.3Dim grey · ΔE 44.5Saddle brown · ΔE 46.1Brown · ΔE 47.2
Nearest named CSS colourBlack (#000000)ΔE 24.83, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#04312B
Analogous#310421, #311504
Triadic#0A3104, #040A31
Split complementary#043115, #042131
Tetradic#213104, #04312B, #140431

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EC1532
Lighter +30%#BE1027
Lighter +20%#8F0C1D
Lighter +10%#600814
Darker −10%#020000
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#350007
Less saturated −25%#2A0B0F

Channel breakdown

R49
G4
B10
Red49 (19.2%)
Green4 (1.6%)
Blue10 (3.9%)
Hue352°
Saturation (HSL)84.91%
Lightness10.39%
Dominant channelRed
Hex per channelR 31 · G 04 · B 0A

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Every value on this page was computed from “31040a” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.