Recognised as Colour

#FB5000

#FB5000
Orange
Dark
Nearest: Orange red

#FB5000 is a orange with RGB values 251, 80, 0 and HSL 19°, 100%, 49%. It is a dark colour, so black text on it reaches 6.2:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#FB5000#FB5000

HEX#FB5000

RGBrgb(251, 80, 0)

RGB (0–1)0.9843, 0.3137, 0

RGB percentages98.4%, 31.4%, 0%

HSLhsl(19.1, 100%, 49.2%)

HSV / HSBhsv(19.1, 100%, 98.4%)

CMYK0%, 68.1%, 100%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,470,016

CSS custom property--colour: #FB5000;

Brightness & contrast

Relative luminance0.26247WCAG 2.x, 0 is black and 1 is white

Perceived brightness150.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.25:1

Contrast with white3.36:1WCAG normal text: Fail

Contrast with black6.25:1WCAG normal text: AA

Greyscale equivalent#6F6F6F

Inverted#04AFFF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#847400no red cones; affects about 1% of men; ΔE 69.2 from the original

Deuteranopia#AE9A00no green cones; the most common form, about 1% of men; ΔE 68.6 from the original

Tritanopia#FF0045no blue cones; rare, and affects men and women equally; ΔE 36.5 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text3.36:1WCAG large text: AA

Contrast with black, large text6.25:1WCAG large text: AAA

Named colours

Orange red · ΔE 5.2 Red · ΔE 18.2 Tomato · ΔE 23.3 Chocolate · ΔE 28.4 Dark orange · ΔE 28.9 Coral · ΔE 29

Nearest named CSS colourOrange red (#FF4500)ΔE 5.17, clearly different but related

Hue familyorange

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#00ABFB

Analogous#FB002E, #FBCD00

Triadic#00FB50, #5000FB

Split complementary#00FBCE, #002DFB

Tetradic#2EFB00, #00ABFB, #CE00FB

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#FFDAC8

Lighter +30%#FFB795

Lighter +20%#FF9462

Lighter +10%#FF712F

Darker −10%#C84000

Darker −20%#952F00

Darker −30%#621F00

Darker −40%#2F0F00

More saturated +25%#FB5000

Less saturated −25%#DC5B1F

Channel breakdown

R251

G80

Red251 (98.4%)

Green80 (31.4%)

Blue0 (0%)

Hue19.12°

Saturation (HSL)100%

Lightness49.22%

Dominant channelRed

Hex per channelR FB · G 50 · B 00

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB5000 (chemical formula)

Formula
54,068.998 g/mol
5001 atoms

FB5000 has a molar mass of 54,068.998 g/mol, made up of 5001 atoms across 2 elements: 1 × F, 5000 × B.

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Molar mass

Molar mass54,068.998 g/mol

Total atoms per molecule5001

Distinct elements2

Mass of one molecule8.9783684 × 10^-20 g

Molecules per gram1.1137881 × 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, 0.035%

Boron (B × 5000)54,050 g/mol, 99.965%

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Elements in this formula

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