Recognised as Colour

#FB4758

#FB4758
Red
Dark
Nearest: Crimson

#FB4758 is a red with RGB values 251, 71, 88 and HSL 354°, 96%, 63%. It is a dark colour, so black text on it reaches 6.1:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FB4758#FB4758

HEX#FB4758

RGBrgb(251, 71, 88)

RGB (0–1)0.9843, 0.2784, 0.3451

RGB percentages98.4%, 27.8%, 34.5%

HSLhsl(354.3, 95.7%, 63.1%)

HSV / HSBhsv(354.3, 71.7%, 98.4%)

CMYK0%, 71.7%, 64.9%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,467,800

CSS custom property--colour: #FB4758;

Brightness & contrast

Relative luminance0.2572WCAG 2.x, 0 is black and 1 is white

Perceived brightness150.6 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.14:1

Contrast with white3.42:1WCAG normal text: Fail

Contrast with black6.14:1WCAG normal text: AA

Greyscale equivalent#6E6E6E

Inverted#04B8A7

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#7A7257no red cones; affects about 1% of men; ΔE 72.1 from the original

Deuteranopia#A79953no green cones; the most common form, about 1% of men; ΔE 73.2 from the original

Tritanopia#FF004Fno blue cones; rare, and affects men and women equally; ΔE 14.1 from the original

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

Contrast with white, large text3.42:1WCAG large text: AA

Contrast with black, large text6.14:1WCAG large text: AAA

Named colours

Crimson · ΔE 11.3 Tomato · ΔE 18.6 Firebrick · ΔE 23.1 Salmon · ΔE 25 Indian red · ΔE 25.6 Brown · ΔE 27.5

Nearest named CSS colourCrimson (#DC143C)ΔE 11.26, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#47FBEA

Analogous#FB47B2, #FB9047

Triadic#58FB47, #4758FB

Split complementary#47FB90, #47B2FB

Tetradic#B2FB47, #47FBEA, #9047FB

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FEDDE0

Lighter +20%#FDABB3

Lighter +10%#FC7985

Darker −10%#FA152B

Darker −20%#D70519

Darker −30%#A50413

Darker −40%#73030D

More saturated +25%#FF4355

Less saturated −25%#E35E6B

Channel breakdown

R251

G71

B88

Red251 (98.4%)

Green71 (27.8%)

Blue88 (34.5%)

Hue354.33°

Saturation (HSL)95.74%

Lightness63.14%

Dominant channelRed

Hex per channelR FB · G 47 · B 58

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB4758 (chemical formula)

Formula
51,452.978 g/mol
4759 atoms

FB4758 has a molar mass of 51,452.978 g/mol, made up of 4759 atoms across 2 elements: 1 × F, 4758 × B.

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Molar mass

Molar mass51,452.978 g/mol

Total atoms per molecule4759

Distinct elements2

Mass of one molecule8.543968 × 10^-20 g

Molecules per gram1.1704164 × 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, 0.037%

Boron (B × 4758)51,433.98 g/mol, 99.963%

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