Recognised as Colour

#FF3949

#FF3949
Red
Dark
Nearest: Crimson

#FF3949 is a red with RGB values 255, 57, 73 and HSL 355°, 100%, 61%. It is a dark colour, so black text on it reaches 5.9:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FF3949#FF3949

HEX#FF3949

RGBrgb(255, 57, 73)

RGB (0–1)1, 0.2235, 0.2863

RGB percentages100%, 22.4%, 28.6%

HSLhsl(355.2, 100%, 61.2%)

HSV / HSBhsv(355.2, 77.6%, 100%)

CMYK0%, 77.6%, 71.4%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,726,345

CSS custom property--colour: #FF3949;

Brightness & contrast

Relative luminance0.24667WCAG 2.x, 0 is black and 1 is white

Perceived brightness148.2 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.93:1

Contrast with white3.54:1WCAG normal text: Fail

Contrast with black5.93:1WCAG normal text: AA

Greyscale equivalent#646464

Inverted#00C6B6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#766D48no red cones; affects about 1% of men; ΔE 78 from the original

Deuteranopia#A79742no green cones; the most common form, about 1% of men; ΔE 78.2 from the original

Tritanopia#FF0041no blue cones; rare, and affects men and women equally; ΔE 8.9 from the original

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

Contrast with white, large text3.54:1WCAG large text: AA

Contrast with black, large text5.93:1WCAG large text: AAA

Named colours

Crimson · ΔE 11.4 Tomato · ΔE 17.6 Firebrick · ΔE 24.5 Red · ΔE 29.2 Orange red · ΔE 30.3 Coral · ΔE 30.7

Nearest named CSS colourCrimson (#DC143C)ΔE 11.36, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#39FFEF

Analogous#FF39AC, #FF8C39

Triadic#49FF39, #3949FF

Split complementary#39FF8C, #39ACFF

Tetradic#ACFF39, #39FFEF, #8C39FF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFD2D6

Lighter +20%#FF9FA7

Lighter +10%#FF6C78

Darker −10%#FF061A

Darker −20%#D20011

Darker −30%#9F000D

Darker −40%#6C0009

More saturated +25%#FF3949

Less saturated −25%#E6525E

Channel breakdown

R255

G57

B73

Red255 (100%)

Green57 (22.4%)

Blue73 (28.6%)

Hue355.15°

Saturation (HSL)100%

Lightness61.18%

Dominant channelRed

Hex per channelR FF · G 39 · B 49

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF3949 (chemical formula)

Formula
75,042.1 g/mol
3950 atoms

FF3949 has a molar mass of 75,042.1 g/mol, made up of 3950 atoms across 1 element: 3950 × F.

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Molar mass

Molar mass75,042.1 g/mol

Total atoms per molecule3950

Distinct elements1

Mass of one molecule1.2461034 × 10^-19 g

Molecules per gram8.0250163 × 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 × 3950)75,042.1 g/mol, 100%

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Elements in this formula

Fluorine

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