Recognised as Colour
#B22837
- #B22837
- Red
- Dark
- Nearest: Brown
#B22837 is a red with RGB values 178, 40, 55 and HSL 353°, 63%, 43%. It is a dark colour, so white text on it reaches 6.5:1 contrast (AA for normal text). The nearest named colour is Brown.
Colour values
#B22837#B22837
HEX#B22837
RGBrgb(178, 40, 55)
RGB (0–1)0.698, 0.1569, 0.2157
RGB percentages69.8%, 15.7%, 21.6%
HSLhsl(353.5, 63.3%, 42.7%)
HSV / HSBhsv(353.5, 77.5%, 69.8%)
CMYK0%, 77.5%, 69.1%, 30.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer11,675,703
CSS custom property--colour: #B22837;
Brightness & contrast
Relative luminance0.11258WCAG 2.x, 0 is black and 1 is white
Perceived brightness103.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.46:1
Contrast with white6.46:1WCAG normal text: AA
Contrast with black3.25:1WCAG normal text: Fail
Greyscale equivalent#464646
Inverted#4DD7C8
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.46:1WCAG large text: AAA
Contrast with black, large text3.25:1WCAG large text: AA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#28B2A3
Analogous#B2287C, #B25E28
Triadic#37B228, #2837B2
Split complementary#28B25E, #287CB2
Tetradic#7CB228, #28B2A3, #5E28B2
Tints, shades & saturation
Channel breakdown
R178
G40
B55
Red178 (69.8%)
Green40 (15.7%)
Blue55 (21.6%)
Hue353.48°
Saturation (HSL)63.3%
Lightness42.75%
Dominant channelRed
Hex per channelR B2 · G 28 · B 37
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Also reads as
B22837 (chemical formula)
- Formula
- 246,867.97 g/mol
- 22837 atoms
B22837 has a molar mass of 246,867.97 g/mol, made up of 22837 atoms across 1 element: 22837 × B.
Molar mass
Molar mass246,867.97 g/mol
Total atoms per molecule22837
Distinct elements1
Mass of one molecule4.0993391 × 10^-19 g
Molecules per gram2.4394176 × 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 × 22837)246,867.97 g/mol, 100%
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