Recognised as Colour
#FB5211
- #FB5211
- Orange
- Dark
- Nearest: Orange red
#FB5211 is a orange with RGB values 251, 82, 17 and HSL 17°, 97%, 53%. It is a dark colour, so black text on it reaches 6.3:1 contrast (AA for normal text). The nearest named colour is Orange red.
Colour values
#FB5211#FB5211
HEX#FB5211
RGBrgb(251, 82, 17)
RGB (0–1)0.9843, 0.3216, 0.0667
RGB percentages98.4%, 32.2%, 6.7%
HSLhsl(16.7, 96.7%, 52.5%)
HSV / HSBhsv(16.7, 93.2%, 98.4%)
CMYK0%, 67.3%, 93.2%, 1.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,470,545
CSS custom property--colour: #FB5211;
Brightness & contrast
Relative luminance0.26584WCAG 2.x, 0 is black and 1 is white
Perceived brightness151.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.32:1
Contrast with white3.32:1WCAG normal text: Fail
Contrast with black6.32:1WCAG normal text: AA
Greyscale equivalent#717171
Inverted#04ADEE
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.32:1WCAG large text: AA
Contrast with black, large text6.32:1WCAG large text: AAA
Named colours
Hue familyorange
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#11BAFB
Analogous#FB1145, #FBC711
Triadic#11FB52, #5211FB
Split complementary#11FBC7, #1145FB
Tetradic#45FB11, #11BAFB, #C711FB
Tints, shades & saturation
Channel breakdown
R251
G82
B17
Red251 (98.4%)
Green82 (32.2%)
Blue17 (6.7%)
Hue16.67°
Saturation (HSL)96.69%
Lightness52.55%
Dominant channelRed
Hex per channelR FB · G 52 · B 11
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Also reads as
FB5211 (chemical formula)
- Formula
- 56,349.908 g/mol
- 5212 atoms
FB5211 has a molar mass of 56,349.908 g/mol, made up of 5212 atoms across 2 elements: 1 × F, 5211 × B.
Molar mass
Molar mass56,349.908 g/mol
Total atoms per molecule5212
Distinct elements2
Mass of one molecule9.3571224 × 10^-20 g
Molecules per gram1.0687046 × 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
F0%
B100%
Fluorine (F)18.998 g/mol, 0.034%
Boron (B × 5211)56,330.91 g/mol, 99.966%
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