Recognised as Colour
#B31F41
- #B31F41
- Red
- Dark
- Nearest: Brown
#B31F41 is a red with RGB values 179, 31, 65 and HSL 346°, 70%, 41%. It is a dark colour, so white text on it reaches 6.6:1 contrast (AA for normal text). The nearest named colour is Brown.
Colour values
#B31F41#B31F41
HEX#B31F41
RGBrgb(179, 31, 65)
RGB (0–1)0.702, 0.1216, 0.2549
RGB percentages70.2%, 12.2%, 25.5%
HSLhsl(346.2, 70.5%, 41.2%)
HSV / HSBhsv(346.2, 82.7%, 70.2%)
CMYK0%, 82.7%, 63.7%, 29.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer11,738,945
CSS custom property--colour: #B31F41;
Brightness & contrast
Relative luminance0.10945WCAG 2.x, 0 is black and 1 is white
Perceived brightness103.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.58:1
Contrast with white6.58:1WCAG normal text: AA
Contrast with black3.19:1WCAG normal text: Fail
Greyscale equivalent#414141
Inverted#4CE0BE
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.58:1WCAG large text: AAA
Contrast with black, large text3.19:1WCAG large text: AA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#1FB391
Analogous#B31F8B, #B3471F
Triadic#41B31F, #1F41B3
Split complementary#1FB347, #1F8BB3
Tetradic#8BB31F, #1FB391, #471FB3
Tints, shades & saturation
Channel breakdown
R179
G31
B65
Red179 (70.2%)
Green31 (12.2%)
Blue65 (25.5%)
Hue346.22°
Saturation (HSL)70.48%
Lightness41.18%
Dominant channelRed
Hex per channelR B3 · G 1F · B 41
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Also reads as
B31F41 (chemical formula)
- Formula
- 1,114.028 g/mol
- 72 atoms
B31F41 has a molar mass of 1,114.028 g/mol, made up of 72 atoms across 2 elements: 31 × B, 41 × F.
Molar mass
Molar mass1,114.028 g/mol
Total atoms per molecule72
Distinct elements2
Mass of one molecule1.849887 × 10^-21 g
Molecules per gram5.4057355 × 10^20
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
B30.1%
F69.9%
Boron (B × 31)335.11 g/mol, 30.081%
Fluorine (F × 41)778.918 g/mol, 69.919%
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