Recognised as Colour

#FF2F39

#FF2F39
Red
Dark
Nearest: Crimson

#FF2F39 is a red with RGB values 255, 47, 57 and HSL 357°, 100%, 59%. It is a dark colour, so black text on it reaches 5.7:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FF2F39#FF2F39

HEX#FF2F39

RGBrgb(255, 47, 57)

RGB (0–1)1, 0.1843, 0.2235

RGB percentages100%, 18.4%, 22.4%

HSLhsl(357.1, 100%, 59.2%)

HSV / HSBhsv(357.1, 81.6%, 100%)

CMYK0%, 81.6%, 77.6%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,723,769

CSS custom property--colour: #FF2F39;

Brightness & contrast

Relative luminance0.23588WCAG 2.x, 0 is black and 1 is white

Perceived brightness145.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.72:1

Contrast with white3.67:1WCAG normal text: Fail

Contrast with black5.72:1WCAG normal text: AA

Greyscale equivalent#5C5C5C

Inverted#00D0C6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#746937no red cones; affects about 1% of men; ΔE 80.5 from the original

Deuteranopia#A69530no green cones; the most common form, about 1% of men; ΔE 80.6 from the original

Tritanopia#FF0036no blue cones; rare, and affects men and women equally; ΔE 6.4 from the original

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

Contrast with white, large text3.67:1WCAG large text: AA

Contrast with black, large text5.72:1WCAG large text: AAA

Named colours

Crimson · ΔE 16.3 Tomato · ΔE 18.2 Red · ΔE 21.2 Orange red · ΔE 23.3 Firebrick · ΔE 26.8 Coral · ΔE 31.7

Nearest named CSS colourCrimson (#DC143C)ΔE 16.27, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#2FFFF5

Analogous#FF2FA1, #FF8D2F

Triadic#39FF2F, #2F39FF

Split complementary#2FFF8D, #2FA1FF

Tetradic#A1FF2F, #2FFFF5, #8D2FFF

Tints, shades & saturation

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

Lighter +40%#FFFBFB

Lighter +30%#FFC8CB

Lighter +20%#FF959A

Lighter +10%#FF626A

Darker −10%#FB000C

Darker −20%#C8000A

Darker −30%#950007

Darker −40%#620005

More saturated +25%#FF2F39

Less saturated −25%#E54950

Channel breakdown

R255

G47

B57

Red255 (100%)

Green47 (18.4%)

Blue57 (22.4%)

Hue357.12°

Saturation (HSL)100%

Lightness59.22%

Dominant channelRed

Hex per channelR FF · G 2F · B 39

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF2F39 (chemical formula)

Formula
797.916 g/mol
42 atoms

FF2F39 has a molar mass of 797.916 g/mol, made up of 42 atoms across 1 element: 42 × F.

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Molar mass

Molar mass797.916 g/mol

Total atoms per molecule42

Distinct elements1

Mass of one molecule1.3249707 × 10^-21 g

Molecules per gram7.5473368 × 10^20

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 × 42)797.916 g/mol, 100%

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Elements in this formula

Fluorine

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