Recognised as Colour
#FB8100
- #FB8100
- Orange
- Dark
- Nearest: Dark orange
#FB8100 is a orange with RGB values 251, 129, 0 and HSL 31°, 100%, 49%. It is a dark colour, so black text on it reaches 8.2:1 contrast (AAA for normal text). The nearest named colour is Dark orange.
Colour values
#FB8100#FB8100
HEX#FB8100
RGBrgb(251, 129, 0)
RGB (0–1)0.9843, 0.5059, 0
RGB percentages98.4%, 50.6%, 0%
HSLhsl(30.8, 100%, 49.2%)
HSV / HSBhsv(30.8, 100%, 98.4%)
CMYK0%, 48.6%, 100%, 1.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,482,560
CSS custom property--colour: #FB8100;
Brightness & contrast
Relative luminance0.3621WCAG 2.x, 0 is black and 1 is white
Perceived brightness169.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.24:1
Contrast with white2.55:1WCAG normal text: Fail
Contrast with black8.24:1WCAG normal text: AAA
Greyscale equivalent#929292
Inverted#047EFF
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.55:1WCAG large text: Fail
Contrast with black, large text8.24:1WCAG large text: AAA
Named colours
Hue familyorange
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#007AFB
Analogous#FB0400, #F7FB00
Triadic#00FB81, #8100FB
Split complementary#00F8FB, #0300FB
Tetradic#00FB03, #007AFB, #FB00F8
Tints, shades & saturation
Channel breakdown
R251
G129
B0
Red251 (98.4%)
Green129 (50.6%)
Blue0 (0%)
Hue30.84°
Saturation (HSL)100%
Lightness49.22%
Dominant channelRed
Hex per channelR FB · G 81 · B 00
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Also reads as
FB8100 (chemical formula)
- Formula
- 87,579.998 g/mol
- 8101 atoms
FB8100 has a molar mass of 87,579.998 g/mol, made up of 8101 atoms across 2 elements: 1 × F, 8100 × B.
Molar mass
Molar mass87,579.998 g/mol
Total atoms per molecule8101
Distinct elements2
Mass of one molecule1.4543001 × 10^-19 g
Molecules per gram6.87616 × 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
F0%
B100%
Fluorine (F)18.998 g/mol, 0.022%
Boron (B × 8100)87,561 g/mol, 99.978%
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