Recognised as Colour
#B21933
- #B21933
- Red
- Dark
- Nearest: Brown
#B21933 is a red with RGB values 178, 25, 51 and HSL 350°, 75%, 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 Brown.
Colour values
#B21933#B21933
HEX#B21933
RGBrgb(178, 25, 51)
RGB (0–1)0.698, 0.098, 0.2
RGB percentages69.8%, 9.8%, 20%
HSLhsl(349.8, 75.4%, 39.8%)
HSV / HSBhsv(349.8, 86%, 69.8%)
CMYK0%, 86%, 71.3%, 30.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer11,671,859
CSS custom property--colour: #B21933;
Brightness & contrast
Relative luminance0.10399WCAG 2.x, 0 is black and 1 is white
Perceived brightness100.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.82:1
Contrast with white6.82:1WCAG normal text: AA
Contrast with black3.08:1WCAG normal text: Fail
Greyscale equivalent#3B3B3B
Inverted#4DE6CC
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.82:1WCAG large text: AAA
Contrast with black, large text3.08:1WCAG large text: AA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#19B298
Analogous#B21980, #B24C19
Triadic#33B219, #1933B2
Split complementary#19B24C, #1980B2
Tetradic#7FB219, #19B298, #4B19B2
Tints, shades & saturation
Channel breakdown
R178
G25
B51
Red178 (69.8%)
Green25 (9.8%)
Blue51 (20%)
Hue349.8°
Saturation (HSL)75.37%
Lightness39.8%
Dominant channelRed
Hex per channelR B2 · G 19 · B 33
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Also reads as
B21933 (chemical formula)
- Formula
- 237,095.73 g/mol
- 21933 atoms
B21933 has a molar mass of 237,095.73 g/mol, made up of 21933 atoms across 1 element: 21933 × B.
Molar mass
Molar mass237,095.73 g/mol
Total atoms per molecule21933
Distinct elements1
Mass of one molecule3.9370672 × 10^-19 g
Molecules per gram2.5399617 × 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 × 21933)237,095.73 g/mol, 100%
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