Recognised as Colour

#F3181C

#F3181C
Red
Dark
Nearest: Red

#F3181C is a red with RGB values 243, 24, 28 and HSL 359°, 90%, 52%. It is a dark colour, so black text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#F3181C#F3181C

HEX#F3181C

RGBrgb(243, 24, 28)

RGB (0–1)0.9529, 0.0941, 0.1098

RGB percentages95.3%, 9.4%, 11%

HSLhsl(358.9, 90.1%, 52.4%)

HSV / HSBhsv(358.9, 90.1%, 95.3%)

CMYK0%, 90.1%, 88.5%, 4.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer15,931,420

CSS custom property--colour: #F3181C;

Brightness & contrast

Relative luminance0.19792WCAG 2.x, 0 is black and 1 is white

Perceived brightness134.5 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 4.96:1

Contrast with white4.24:1WCAG normal text: Fail

Contrast with black4.96:1WCAG normal text: AA

Greyscale equivalent#474747

Inverted#0CE7E3

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6A5E17no red cones; affects about 1% of men; ΔE 81.6 from the original

Deuteranopia#9C8B03no green cones; the most common form, about 1% of men; ΔE 81.5 from the original

Tritanopia#FF0020no blue cones; rare, and affects men and women equally; ΔE 5.4 from the original

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

Contrast with white, large text4.24:1WCAG large text: AA

Contrast with black, large text4.96:1WCAG large text: AAA

Named colours

Red · ΔE 11.8 Orange red · ΔE 15.7 Tomato · ΔE 22.8 Crimson · ΔE 23.8 Firebrick · ΔE 29.8 Coral · ΔE 35

Nearest named CSS colourRed (#FF0000)ΔE 11.81, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#18F3EF

Analogous#F31889, #F38118

Triadic#1CF318, #181CF3

Split complementary#18F381, #1889F3

Tetradic#8AF318, #18F3EF, #8218F3

Tints, shades & saturation

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

Lighter +40%#FDDADB

Lighter +30%#FBA9AB

Lighter +20%#F8797B

Lighter +10%#F6484C

Darker −10%#CD0B0E

Darker −20%#9D080B

Darker −30%#6C0608

Darker −40%#3C0304

More saturated +25%#FF0C10

Less saturated −25%#D53639

Channel breakdown

R243

G24

B28

Red243 (95.3%)

Green24 (9.4%)

Blue28 (11%)

Hue358.9°

Saturation (HSL)90.12%

Lightness52.35%

Dominant channelRed

Hex per channelR F3 · G 18 · B 1C

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Harmonies

Lighter and darker

Similar named colours

Also reads as

F3181C (chemical formula)

Formula
60,444.649 g/mol
3182 atoms

F3181C has a molar mass of 60,444.649 g/mol, made up of 3182 atoms across 2 elements: 3181 × F, 1 × C.

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Molar mass

Molar mass60,444.649 g/mol

Total atoms per molecule3182

Distinct elements2

Mass of one molecule1.003707 × 10^-19 g

Molecules per gram9.9630668 × 10^18

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%

C0%

Fluorine (F × 3181)60,432.638 g/mol, 99.98%

Carbon (C)12.011 g/mol, 0.02%

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