Recognised as Colour
#F3281F
- #F3281F
- Red
- Dark
- Nearest: Red
#F3281F is a red with RGB values 243, 40, 31 and HSL 3°, 90%, 54%. It is a dark colour, so black text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Red.
Colour values
#F3281F#F3281F
HEX#F3281F
RGBrgb(243, 40, 31)
RGB (0–1)0.9529, 0.1569, 0.1216
RGB percentages95.3%, 15.7%, 12.2%
HSLhsl(2.5, 89.8%, 53.7%)
HSV / HSBhsv(2.5, 87.2%, 95.3%)
CMYK0%, 83.5%, 87.2%, 4.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer15,935,519
CSS custom property--colour: #F3281F;
Brightness & contrast
Relative luminance0.20671WCAG 2.x, 0 is black and 1 is white
Perceived brightness136.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.13:1
Contrast with white4.09:1WCAG normal text: Fail
Contrast with black5.13:1WCAG normal text: AA
Greyscale equivalent#535353
Inverted#0CD7E0
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.09:1WCAG large text: AA
Contrast with black, large text5.13:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#1FEAF3
Analogous#F31F80, #F3921F
Triadic#1FF328, #281FF3
Split complementary#1FF392, #1F80F3
Tetradic#80F31F, #1FEAF3, #921FF3
Tints, shades & saturation
Channel breakdown
R243
G40
B31
Red243 (95.3%)
Green40 (15.7%)
Blue31 (12.2%)
Hue2.55°
Saturation (HSL)89.83%
Lightness53.73%
Dominant channelRed
Hex per channelR F3 · G 28 · B 1F
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Also reads as
F3281F (chemical formula)
- Formula
- 62,351.436 g/mol
- 3282 atoms
F3281F has a molar mass of 62,351.436 g/mol, made up of 3282 atoms across 1 element: 3282 × F.
Molar mass
Molar mass62,351.436 g/mol
Total atoms per molecule3282
Distinct elements1
Mass of one molecule1.03537 × 10^-19 g
Molecules per gram9.6583834 × 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
F100%
Fluorine (F × 3282)62,351.436 g/mol, 100%
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