Recognised as Colour
#B2191F
- #B2191F
- Red
- Dark
- Nearest: Firebrick
#B2191F is a red with RGB values 178, 25, 31 and HSL 358°, 75%, 40%. It is a dark colour, so white text on it reaches 6.9:1 contrast (AA for normal text). The nearest named colour is Firebrick.
Colour values
#B2191F#B2191F
HEX#B2191F
RGBrgb(178, 25, 31)
RGB (0–1)0.698, 0.098, 0.1216
RGB percentages69.8%, 9.8%, 12.2%
HSLhsl(357.6, 75.4%, 39.8%)
HSV / HSBhsv(357.6, 86%, 69.8%)
CMYK0%, 86%, 82.6%, 30.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer11,671,839
CSS custom property--colour: #B2191F;
Brightness & contrast
Relative luminance0.10259WCAG 2.x, 0 is black and 1 is white
Perceived brightness99.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.88:1
Contrast with white6.88:1WCAG normal text: AA
Contrast with black3.05:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#4DE6E0
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.88:1WCAG large text: AAA
Contrast with black, large text3.05:1WCAG large text: AA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#19B2AC
Analogous#B2196C, #B25F19
Triadic#1FB219, #191FB2
Split complementary#19B25F, #196CB2
Tetradic#6CB219, #19B2AC, #5F19B2
Tints, shades & saturation
Channel breakdown
R178
G25
B31
Red178 (69.8%)
Green25 (9.8%)
Blue31 (12.2%)
Hue357.65°
Saturation (HSL)75.37%
Lightness39.8%
Dominant channelRed
Hex per channelR B2 · G 19 · B 1F
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Also reads as
B2191F (chemical formula)
- Formula
- 23,703.708 g/mol
- 2192 atoms
B2191F has a molar mass of 23,703.708 g/mol, made up of 2192 atoms across 2 elements: 2191 × B, 1 × F.
Molar mass
Molar mass23,703.708 g/mol
Total atoms per molecule2192
Distinct elements2
Mass of one molecule3.9360933 × 10^-20 g
Molecules per gram2.5405902 × 10^19
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
B99.9%
F0.1%
Boron (B × 2191)23,684.71 g/mol, 99.92%
Fluorine (F)18.998 g/mol, 0.08%
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