Recognised as Colour
#B31109
- #B31109
- Red
- Dark
- Nearest: Firebrick
#B31109 is a red with RGB values 179, 17, 9 and HSL 3°, 90%, 37%. It is a dark colour, so white text on it reaches 7:1 contrast (AA for normal text). The nearest named colour is Firebrick.
Colour values
#B31109#B31109
HEX#B31109
RGBrgb(179, 17, 9)
RGB (0–1)0.702, 0.0667, 0.0353
RGB percentages70.2%, 6.7%, 3.5%
HSLhsl(2.8, 90.4%, 36.9%)
HSV / HSBhsv(2.8, 95%, 70.2%)
CMYK0%, 90.5%, 95%, 29.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer11,735,305
CSS custom property--colour: #B31109;
Brightness & contrast
Relative luminance0.10004WCAG 2.x, 0 is black and 1 is white
Perceived brightness98.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7:1
Contrast with white7:1WCAG normal text: AA
Contrast with black3:1WCAG normal text: Fail
Greyscale equivalent#333333
Inverted#4CEEF6
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7:1WCAG large text: AAA
Contrast with black, large text3:1WCAG large text: AA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#09ABB3
Analogous#B30956, #B36609
Triadic#09B311, #1109B3
Split complementary#09B366, #0956B3
Tetradic#56B309, #09ABB3, #6609B3
Tints, shades & saturation
Channel breakdown
R179
G17
B9
Red179 (70.2%)
Green17 (6.7%)
Blue9 (3.5%)
Hue2.82°
Saturation (HSL)90.43%
Lightness36.86%
Dominant channelRed
Hex per channelR B3 · G 11 · B 09
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Also reads as
B31109 (chemical formula)
- Formula
- 336,288.29 g/mol
- 31109 atoms
B31109 has a molar mass of 336,288.29 g/mol, made up of 31109 atoms across 1 element: 31109 × B.
Molar mass
Molar mass336,288.29 g/mol
Total atoms per molecule31109
Distinct elements1
Mass of one molecule5.5841984 × 10^-19 g
Molecules per gram1.7907673 × 10^18
Name
NameNot in the name tablea name cannot be worked out from a formula alone: isomers share formulas, and naming depends on bonding the formula does not show
Composition by mass
B100%
Boron (B × 31109)336,288.29 g/mol, 100%
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