Recognised as Colour
#F10B25
- #F10B25
- Red
- Dark
- Nearest: Red
#F10B25 is a red with RGB values 241, 11, 37 and HSL 353°, 91%, 49%. It is a dark colour, so black text on it reaches 4.8:1 contrast (AA for normal text). The nearest named colour is Red.
Colour values
#F10B25#F10B25
HEX#F10B25
RGBrgb(241, 11, 37)
RGB (0–1)0.9451, 0.0431, 0.1451
RGB percentages94.5%, 4.3%, 14.5%
HSLhsl(353.2, 91.3%, 49.4%)
HSV / HSBhsv(353.2, 95.4%, 94.5%)
CMYK0%, 95.4%, 84.6%, 5.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer15,797,029
CSS custom property--colour: #F10B25;
Brightness & contrast
Relative luminance0.19074WCAG 2.x, 0 is black and 1 is white
Perceived brightness132.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.81:1
Contrast with white4.36:1WCAG normal text: Fail
Contrast with black4.81:1WCAG normal text: AA
Greyscale equivalent#3E3E3E
Inverted#0EF4DA
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.36:1WCAG large text: AA
Contrast with black, large text4.81:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#0BF1D7
Analogous#F10B98, #F1640B
Triadic#25F10B, #0B25F1
Split complementary#0BF164, #0B98F1
Tetradic#98F10B, #0BF1D7, #640BF1
Tints, shades & saturation
Channel breakdown
R241
G11
B37
Red241 (94.5%)
Green11 (4.3%)
Blue37 (14.5%)
Hue353.22°
Saturation (HSL)91.27%
Lightness49.41%
Dominant channelRed
Hex per channelR F1 · G 0B · B 25
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Also reads as
F10B25 (chemical formula)
- Formula
- 460.23 g/mol
- 35 atoms
F10B25 has a molar mass of 460.23 g/mol, made up of 35 atoms across 2 elements: 10 × F, 25 × B.
Molar mass
Molar mass460.23 g/mol
Total atoms per molecule35
Distinct elements2
Mass of one molecule7.6422989 × 10^-22 g
Molecules per gram1.3085068 × 10^21
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
F41.3%
B58.7%
Fluorine (F × 10)189.98 g/mol, 41.279%
Boron (B × 25)270.25 g/mol, 58.721%
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