Recognised as Colour

#F31561

#F31561
Red
Dark
Nearest: Crimson

#F31561 is a red with RGB values 243, 21, 97 and HSL 339°, 90%, 52%. 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

#F31561#F31561

HEX#F31561

RGBrgb(243, 21, 97)

RGB (0–1)0.9529, 0.0824, 0.3804

RGB percentages95.3%, 8.2%, 38%

HSLhsl(339.5, 90.2%, 51.8%)

HSV / HSBhsv(339.5, 91.4%, 95.3%)

CMYK0%, 91.4%, 60.1%, 4.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer15,930,721

CSS custom property--colour: #F31561;

Brightness & contrast

Relative luminance0.20454WCAG 2.x, 0 is black and 1 is white

Perceived brightness137.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.09:1

Contrast with white4.13:1WCAG normal text: Fail

Contrast with black5.09:1WCAG normal text: AA

Greyscale equivalent#4A4A4A

Inverted#0CEA9E

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#616162no red cones; affects about 1% of men; ΔE 81.1 from the original

Deuteranopia#978C5Bno green cones; the most common form, about 1% of men; ΔE 82.2 from the original

Tritanopia#FF003Cno blue cones; rare, and affects men and women equally; ΔE 24.2 from the original

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

Contrast with white, large text4.13:1WCAG large text: AA

Contrast with black, large text5.09:1WCAG large text: AAA

Named colours

Crimson · ΔE 17.2 Deep pink · ΔE 25.7 Firebrick · ΔE 32 Indian red · ΔE 33.5 Brown · ΔE 34.1 Hot pink · ΔE 35.2

Nearest named CSS colourCrimson (#DC143C)ΔE 17.22, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#15F3A7

Analogous#F315D0, #F33815

Triadic#61F315, #1561F3

Split complementary#15F338, #15D0F3

Tetradic#D0F315, #15F3A7, #3815F3

Tints, shades & saturation

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

Lighter +40%#FDD7E4

Lighter +30%#FAA7C3

Lighter +20%#F876A3

Lighter +10%#F54682

Darker −10%#CB0A4C

Darker −20%#9A083A

Darker −30%#6A0528

Darker −40%#390315

More saturated +25%#FF095D

Less saturated −25%#D4346B

Channel breakdown

R243

G21

B97

Red243 (95.3%)

Green21 (8.2%)

Blue97 (38%)

Hue339.46°

Saturation (HSL)90.24%

Lightness51.76%

Dominant channelRed

Hex per channelR F3 · G 15 · B 61

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Harmonies

Lighter and darker

Similar named colours

Also reads as

F31561 (chemical formula)

Formula
599,595.878 g/mol
31561 atoms

F31561 has a molar mass of 599,595.878 g/mol, made up of 31561 atoms across 1 element: 31561 × F.

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Molar mass

Molar mass599,595.878 g/mol

Total atoms per molecule31561

Distinct elements1

Mass of one molecule9.9565238 × 10^-19 g

Molecules per gram1.0043666 × 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%

Fluorine (F × 31561)599,595.878 g/mol, 100%

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Elements in this formula

Fluorine

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