Recognised as Colour

#FB2731

#FB2731
Red
Dark
Nearest: Crimson

#FB2731 is a red with RGB values 251, 39, 49 and HSL 357°, 96%, 57%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FB2731#FB2731

HEX#FB2731

RGBrgb(251, 39, 49)

RGB (0–1)0.9843, 0.1529, 0.1922

RGB percentages98.4%, 15.3%, 19.2%

HSLhsl(357.2, 96.4%, 56.9%)

HSV / HSBhsv(357.2, 84.5%, 98.4%)

CMYK0%, 84.5%, 80.5%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,459,569

CSS custom property--colour: #FB2731;

Brightness & contrast

Relative luminance0.22182WCAG 2.x, 0 is black and 1 is white

Perceived brightness141.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.44:1

Contrast with white3.86:1WCAG normal text: Fail

Contrast with black5.44:1WCAG normal text: AA

Greyscale equivalent#555555

Inverted#04D8CE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#70652Eno red cones; affects about 1% of men; ΔE 81.3 from the original

Deuteranopia#A39226no green cones; the most common form, about 1% of men; ΔE 81.3 from the original

Tritanopia#FF002Fno blue cones; rare, and affects men and women equally; ΔE 5.5 from the original

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

Contrast with white, large text3.86:1WCAG large text: AA

Contrast with black, large text5.44:1WCAG large text: AAA

Named colours

Crimson · ΔE 17.8 Red · ΔE 18.5 Tomato · ΔE 19.4 Orange red · ΔE 21.3 Firebrick · ΔE 27.2 Coral · ΔE 32.7

Nearest named CSS colourCrimson (#DC143C)ΔE 17.85, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#27FBF1

Analogous#FB279B, #FB8727

Triadic#31FB27, #2731FB

Split complementary#27FB87, #279BFB

Tetradic#9BFB27, #27FBF1, #8727FB

Tints, shades & saturation

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

Lighter +40%#FFEFF0

Lighter +30%#FEBDC0

Lighter +20%#FD8B91

Lighter +10%#FC5961

Darker −10%#EB040F

Darker −20%#B9030C

Darker −30%#870209

Darker −40%#540205

More saturated +25%#FF232D

Less saturated −25%#DF434A

Channel breakdown

R251

G39

B49

Red251 (98.4%)

Green39 (15.3%)

Blue49 (19.2%)

Hue357.17°

Saturation (HSL)96.36%

Lightness56.86%

Dominant channelRed

Hex per channelR FB · G 27 · B 31

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB2731 (chemical formula)

Formula
29,541.108 g/mol
2732 atoms

FB2731 has a molar mass of 29,541.108 g/mol, made up of 2732 atoms across 2 elements: 1 × F, 2731 × B.

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Molar mass

Molar mass29,541.108 g/mol

Total atoms per molecule2732

Distinct elements2

Mass of one molecule4.9054164 × 10^-20 g

Molecules per gram2.0385629 × 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

F0.1%

B99.9%

Fluorine (F)18.998 g/mol, 0.064%

Boron (B × 2731)29,522.11 g/mol, 99.936%

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Elements in this formula

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