Colour
#B51717
- #B51717
- Red
- Dark
- Nearest: Firebrick
#B51717 is a red with RGB values 181, 23, 23 and HSL 0°, 77%, 40%. It is a dark colour, so white text on it reaches 6.8:1 contrast (AA for normal text). The nearest named colour is Firebrick.
Colour values
#B51717#B51717
HEX#B51717
RGBrgb(181, 23, 23)
RGB (0–1)0.7098, 0.0902, 0.0902
RGB percentages71%, 9%, 9%
HSLhsl(0, 77.5%, 40%)
HSV / HSBhsv(0, 87.3%, 71%)
CMYK0%, 87.3%, 87.3%, 29%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer11,867,927
CSS custom property--colour: #B51717;
Brightness & contrast
Relative luminance0.10498WCAG 2.x, 0 is black and 1 is white
Perceived brightness100.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.77:1
Contrast with white6.77:1WCAG normal text: AA
Contrast with black3.1:1WCAG normal text: Fail
Greyscale equivalent#393939
Inverted#4AE8E8
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.77:1WCAG large text: AAA
Contrast with black, large text3.1:1WCAG large text: AA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#17B5B5
Analogous#B51766, #B56617
Triadic#17B517, #1717B5
Split complementary#17B566, #1766B5
Tetradic#66B517, #17B5B5, #6617B5
Tints, shades & saturation
Channel breakdown
R181
G23
B23
Red181 (71%)
Green23 (9%)
Blue23 (9%)
Hue0°
Saturation (HSL)77.45%
Lightness40%
Dominant channelRed
Hex per channelR B5 · G 17 · B 17
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Nerdulate something else
Nothing in mind? Surprise me · today’s page