Recognised as Colour
#B52031
- #B52031
- Red
- Dark
- Nearest: Firebrick
#B52031 is a red with RGB values 181, 32, 49 and HSL 353°, 70%, 42%. It is a dark colour, so white text on it reaches 6.5:1 contrast (AA for normal text). The nearest named colour is Firebrick.
Colour values
#B52031#B52031
HEX#B52031
RGBrgb(181, 32, 49)
RGB (0–1)0.7098, 0.1255, 0.1922
RGB percentages71%, 12.5%, 19.2%
HSLhsl(353.2, 70%, 41.8%)
HSV / HSBhsv(353.2, 82.3%, 71%)
CMYK0%, 82.3%, 72.9%, 29%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer11,870,257
CSS custom property--colour: #B52031;
Brightness & contrast
Relative luminance0.11079WCAG 2.x, 0 is black and 1 is white
Perceived brightness103.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.53:1
Contrast with white6.53:1WCAG normal text: AA
Contrast with black3.22:1WCAG normal text: Fail
Greyscale equivalent#414141
Inverted#4ADFCE
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.53:1WCAG large text: AAA
Contrast with black, large text3.22:1WCAG large text: AA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#20B5A4
Analogous#B5207B, #B55A20
Triadic#31B520, #2031B5
Split complementary#20B55A, #207BB5
Tetradic#7BB520, #20B5A4, #5A20B5
Tints, shades & saturation
Channel breakdown
R181
G32
B49
Red181 (71%)
Green32 (12.5%)
Blue49 (19.2%)
Hue353.15°
Saturation (HSL)69.95%
Lightness41.76%
Dominant channelRed
Hex per channelR B5 · G 20 · B 31
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Also reads as
B52031 (chemical formula)
- Formula
- 562,455.11 g/mol
- 52031 atoms
B52031 has a molar mass of 562,455.11 g/mol, made up of 52031 atoms across 1 element: 52031 × B.
Molar mass
Molar mass562,455.11 g/mol
Total atoms per molecule52031
Distinct elements1
Mass of one molecule9.3397868 × 10^-19 g
Molecules per gram1.0706882 × 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 × 52031)562,455.11 g/mol, 100%
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