Recognised as Colour
#FB131F
- #FB131F
- Red
- Dark
- Nearest: Red
#FB131F is a red with RGB values 251, 19, 31 and HSL 357°, 97%, 53%. It is a dark colour, so black text on it reaches 5.2:1 contrast (AA for normal text). The nearest named colour is Red.
Colour values
#FB131F#FB131F
HEX#FB131F
RGBrgb(251, 19, 31)
RGB (0–1)0.9843, 0.0745, 0.1216
RGB percentages98.4%, 7.5%, 12.2%
HSLhsl(356.9, 96.7%, 52.9%)
HSV / HSBhsv(356.9, 92.4%, 98.4%)
CMYK0%, 92.4%, 87.6%, 1.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,454,431
CSS custom property--colour: #FB131F;
Brightness & contrast
Relative luminance0.21074WCAG 2.x, 0 is black and 1 is white
Perceived brightness138.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.21:1
Contrast with white4.03:1WCAG normal text: Fail
Contrast with black5.21:1WCAG normal text: AA
Greyscale equivalent#454545
Inverted#04ECE0
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.03:1WCAG large text: AA
Contrast with black, large text5.21:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#13FBEF
Analogous#FB1393, #FB7B13
Triadic#1FFB13, #131FFB
Split complementary#13FB7B, #1393FB
Tetradic#93FB13, #13FBEF, #7B13FB
Tints, shades & saturation
Channel breakdown
R251
G19
B31
Red251 (98.4%)
Green19 (7.5%)
Blue31 (12.2%)
Hue356.9°
Saturation (HSL)96.67%
Lightness52.94%
Dominant channelRed
Hex per channelR FB · G 13 · B 1F
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Also reads as
FB131F (chemical formula)
- Formula
- 1,454.106 g/mol
- 133 atoms
FB131F has a molar mass of 1,454.106 g/mol, made up of 133 atoms across 2 elements: 2 × F, 131 × B.
Molar mass
Molar mass1,454.106 g/mol
Total atoms per molecule133
Distinct elements2
Mass of one molecule2.4145998 × 10^-21 g
Molecules per gram4.141473 × 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
F2.6%
B97.4%
Fluorine (F × 2)37.996 g/mol, 2.613%
Boron (B × 131)1,416.11 g/mol, 97.387%
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