Recognised as Colour
#B21730
- #B21730
- Red
- Dark
- Nearest: Brown
#B21730 is a red with RGB values 178, 23, 48 and HSL 350°, 77%, 39%. It is a dark colour, so white text on it reaches 6.9:1 contrast (AA for normal text). The nearest named colour is Brown.
Colour values
#B21730#B21730
HEX#B21730
RGBrgb(178, 23, 48)
RGB (0–1)0.698, 0.0902, 0.1882
RGB percentages69.8%, 9%, 18.8%
HSLhsl(350.3, 77.1%, 39.4%)
HSV / HSBhsv(350.3, 87.1%, 69.8%)
CMYK0%, 87.1%, 73%, 30.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer11,671,344
CSS custom property--colour: #B21730;
Brightness & contrast
Relative luminance0.10291WCAG 2.x, 0 is black and 1 is white
Perceived brightness100.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.87:1
Contrast with white6.87:1WCAG normal text: AA
Contrast with black3.06:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#4DE8CF
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.87:1WCAG large text: AAA
Contrast with black, large text3.06:1WCAG large text: AA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#17B299
Analogous#B2177E, #B24B17
Triadic#30B217, #1730B2
Split complementary#17B24B, #177EB2
Tetradic#7EB217, #17B299, #4B17B2
Tints, shades & saturation
Channel breakdown
R178
G23
B48
Red178 (69.8%)
Green23 (9%)
Blue48 (18.8%)
Hue350.32°
Saturation (HSL)77.11%
Lightness39.41%
Dominant channelRed
Hex per channelR B2 · G 17 · B 30
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Also reads as
B21730 (chemical formula)
- Formula
- 234,901.3 g/mol
- 21730 atoms
B21730 has a molar mass of 234,901.3 g/mol, made up of 21730 atoms across 1 element: 21730 × B.
Molar mass
Molar mass234,901.3 g/mol
Total atoms per molecule21730
Distinct elements1
Mass of one molecule3.9006279 × 10^-19 g
Molecules per gram2.5636898 × 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 × 21730)234,901.3 g/mol, 100%
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