Recognised as Colour

#FB3871

#FB3871
Red
Dark
Nearest: Crimson

#FB3871 is a red with RGB values 251, 56, 113 and HSL 342°, 96%, 60%. It is a dark colour, so black text on it reaches 5.9:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FB3871#FB3871

HEX#FB3871

RGBrgb(251, 56, 113)

RGB (0–1)0.9843, 0.2196, 0.4431

RGB percentages98.4%, 22%, 44.3%

HSLhsl(342.5, 96.1%, 60.2%)

HSV / HSBhsv(342.5, 77.7%, 98.4%)

CMYK0%, 77.7%, 55%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,463,985

CSS custom property--colour: #FB3871;

Brightness & contrast

Relative luminance0.2453WCAG 2.x, 0 is black and 1 is white

Perceived brightness148.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.91:1

Contrast with white3.56:1WCAG normal text: Fail

Contrast with black5.91:1WCAG normal text: AA

Greyscale equivalent#666666

Inverted#04C78E

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6E6F72no red cones; affects about 1% of men; ΔE 76.7 from the original

Deuteranopia#A0966Cno green cones; the most common form, about 1% of men; ΔE 77.9 from the original

Tritanopia#FF0051no blue cones; rare, and affects men and women equally; ΔE 17.5 from the original

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

Contrast with white, large text3.56:1WCAG large text: AA

Contrast with black, large text5.91:1WCAG large text: AAA

Named colours

Crimson · ΔE 20.9 Deep pink · ΔE 23.4 Hot pink · ΔE 29.3 Indian red · ΔE 30.4 Pale violetred · ΔE 32.7 Medium violet red · ΔE 32.9

Nearest named CSS colourCrimson (#DC143C)ΔE 20.86, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#38FBC2

Analogous#FB38D2, #FB6038

Triadic#71FB38, #3871FB

Split complementary#38FB60, #38D3FB

Tetradic#D3FB38, #38FBC2, #6138FB

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FECEDC

Lighter +20%#FD9CB8

Lighter +10%#FC6A95

Darker −10%#FA064D

Darker −20%#C9043E

Darker −30%#97032E

Darker −40%#65021F

More saturated +25%#FF346F

Less saturated −25%#E2517C

Channel breakdown

R251

G56

B113

Red251 (98.4%)

Green56 (22%)

Blue113 (44.3%)

Hue342.46°

Saturation (HSL)96.06%

Lightness60.2%

Dominant channelRed

Hex per channelR FB · G 38 · B 71

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB3871 (chemical formula)

Formula
41,864.508 g/mol
3872 atoms

FB3871 has a molar mass of 41,864.508 g/mol, made up of 3872 atoms across 2 elements: 1 × F, 3871 × B.

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Molar mass

Molar mass41,864.508 g/mol

Total atoms per molecule3872

Distinct elements2

Mass of one molecule6.9517651 × 10^-20 g

Molecules per gram1.4384836 × 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, 0.045%

Boron (B × 3871)41,845.51 g/mol, 99.955%

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