Recognised as Colour

#FF3943

#FF3943
Red
Dark
Nearest: Crimson

#FF3943 is a red with RGB values 255, 57, 67 and HSL 357°, 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

#FF3943#FF3943

HEX#FF3943

RGBrgb(255, 57, 67)

RGB (0–1)1, 0.2235, 0.2627

RGB percentages100%, 22.4%, 26.3%

HSLhsl(357, 100%, 61.2%)

HSV / HSBhsv(357, 77.6%, 100%)

CMYK0%, 77.6%, 73.7%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,726,339

CSS custom property--colour: #FF3943;

Brightness & contrast

Relative luminance0.24592WCAG 2.x, 0 is black and 1 is white

Perceived brightness147.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.92:1

Contrast with white3.55:1WCAG normal text: Fail

Contrast with black5.92:1WCAG normal text: AA

Greyscale equivalent#646464

Inverted#00C6BC

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#776D41no red cones; affects about 1% of men; ΔE 78 from the original

Deuteranopia#A8973Bno green cones; the most common form, about 1% of men; ΔE 78 from the original

Tritanopia#FF003Fno blue cones; rare, and affects men and women equally; ΔE 9.1 from the original

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

Contrast with white, large text3.55:1WCAG large text: AA

Contrast with black, large text5.92:1WCAG large text: AAA

Named colours

Crimson · ΔE 13.2 Tomato · ΔE 16.3 Firebrick · ΔE 24.7 Red · ΔE 26.1 Orange red · ΔE 27 Coral · ΔE 29.8

Nearest named CSS colourCrimson (#DC143C)ΔE 13.18, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#39FFF5

Analogous#FF39A6, #FF9239

Triadic#43FF39, #3943FF

Split complementary#39FF92, #39A6FF

Tetradic#A6FF39, #39FFF5, #9239FF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFD2D4

Lighter +20%#FF9FA4

Lighter +10%#FF6C73

Darker −10%#FF0613

Darker −20%#D2000B

Darker −30%#9F0008

Darker −40%#6C0005

More saturated +25%#FF3943

Less saturated −25%#E65259

Channel breakdown

R255

G57

B67

Red255 (100%)

Green57 (22.4%)

Blue67 (26.3%)

Hue356.97°

Saturation (HSL)100%

Lightness61.18%

Dominant channelRed

Hex per channelR FF · G 39 · B 43

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF3943 (chemical formula)

Formula
74,928.112 g/mol
3944 atoms

FF3943 has a molar mass of 74,928.112 g/mol, made up of 3944 atoms across 1 element: 3944 × F.

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Molar mass

Molar mass74,928.112 g/mol

Total atoms per molecule3944

Distinct elements1

Mass of one molecule1.2442106 × 10^-19 g

Molecules per gram8.0372247 × 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 × 3944)74,928.112 g/mol, 100%

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Elements in this formula

Fluorine

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