Recognised as Colour

#F81534

#F81534
Red
Dark
Nearest: Crimson

#F81534 is a red with RGB values 248, 21, 52 and HSL 352°, 94%, 53%. It is a dark colour, so black text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#F81534#F81534

HEX#F81534

RGBrgb(248, 21, 52)

RGB (0–1)0.9725, 0.0824, 0.2039

RGB percentages97.3%, 8.2%, 20.4%

HSLhsl(351.8, 94.2%, 52.7%)

HSV / HSBhsv(351.8, 91.5%, 97.3%)

CMYK0%, 91.5%, 79%, 2.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,258,356

CSS custom property--colour: #F81534;

Brightness & contrast

Relative luminance0.20741WCAG 2.x, 0 is black and 1 is white

Perceived brightness137.7 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.15:1

Contrast with white4.08:1WCAG normal text: Fail

Contrast with black5.15:1WCAG normal text: AA

Greyscale equivalent#474747

Inverted#07EACB

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6A6032no red cones; affects about 1% of men; ΔE 83.2 from the original

Deuteranopia#9E8E29no green cones; the most common form, about 1% of men; ΔE 83.4 from the original

Tritanopia#FF0027no blue cones; rare, and affects men and women equally; ΔE 8.6 from the original

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

Contrast with white, large text4.08:1WCAG large text: AA

Contrast with black, large text5.15:1WCAG large text: AAA

Named colours

Crimson · ΔE 15.1 Red · ΔE 21.4 Tomato · ΔE 21.8 Orange red · ΔE 25.4 Firebrick · ΔE 26.8 Brown · ΔE 35.2

Nearest named CSS colourCrimson (#DC143C)ΔE 15.1, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#15F8D9

Analogous#F815A5, #F86815

Triadic#34F815, #1534F8

Split complementary#15F868, #15A5F8

Tetradic#A5F815, #15F8D9, #6815F8

Tints, shades & saturation

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

Lighter +40%#FEDBE0

Lighter +30%#FCAAB5

Lighter +20%#FB788A

Lighter +10%#F9475F

Darker −10%#D40622

Darker −20%#A2051A

Darker −30%#710312

Darker −40%#3F020A

More saturated +25%#FF0E2F

Less saturated −25%#DA334A

Channel breakdown

R248

G21

B52

Red248 (97.3%)

Green21 (8.2%)

Blue52 (20.4%)

Hue351.81°

Saturation (HSL)94.19%

Lightness52.75%

Dominant channelRed

Hex per channelR F8 · G 15 · B 34

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Harmonies

Lighter and darker

Similar named colours

Also reads as

F81534 (chemical formula)

Formula
1,548,982.932 g/mol
81534 atoms

F81534 has a molar mass of 1,548,982.932 g/mol, made up of 81534 atoms across 1 element: 81534 × F.

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Molar mass

Molar mass1,548,982.932 g/mol

Total atoms per molecule81534

Distinct elements1

Mass of one molecule2.5721467 × 10^-18 g

Molecules per gram3.8878032 × 10^17

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

F100%

Fluorine (F × 81534)1,548,982.932 g/mol, 100%

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Elements in this formula

Fluorine

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