Recognised as Colour
#31010B
- #31010B
- Red
- Dark
- Nearest: Black
#31010B is a red with RGB values 49, 1, 11 and HSL 348°, 96%, 10%. It is a dark colour, so white text on it reaches 18.4:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#31010B#31010B
HEX#31010B
RGBrgb(49, 1, 11)
RGB (0–1)0.1922, 0.0039, 0.0431
RGB percentages19.2%, 0.4%, 4.3%
HSLhsl(347.5, 96%, 9.8%)
HSV / HSBhsv(347.5, 98%, 19.2%)
CMYK0%, 98%, 77.6%, 80.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,211,531
CSS custom property--colour: #31010B;
Brightness & contrast
Relative luminance0.00699WCAG 2.x, 0 is black and 1 is white
Perceived brightness27.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 18.42:1
Contrast with white18.42:1WCAG normal text: AAA
Contrast with black1.14:1WCAG normal text: Fail
Greyscale equivalent#0C0C0C
Inverted#CEFEF4
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text18.42:1WCAG large text: AAA
Contrast with black, large text1.14:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#013127
Analogous#310123, #310F01
Triadic#0B3101, #010B31
Split complementary#01310F, #012331
Tetradic#233101, #013127, #0F0131
Tints, shades & saturation
Channel breakdown
R49
G1
B11
Red49 (19.2%)
Green1 (0.4%)
Blue11 (4.3%)
Hue347.5°
Saturation (HSL)96%
Lightness9.8%
Dominant channelRed
Hex per channelR 31 · G 01 · B 0B
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