Recognised as Colour

#CF3740

#CF3740
Red
Dark
Nearest: Firebrick

#CF3740 is a red with RGB values 207, 55, 64 and HSL 356°, 61%, 51%. It is a dark colour, so white text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#CF3740#CF3740

HEX#CF3740

RGBrgb(207, 55, 64)

RGB (0–1)0.8118, 0.2157, 0.251

RGB percentages81.2%, 21.6%, 25.1%

HSLhsl(356.4, 61.3%, 51.4%)

HSV / HSBhsv(356.4, 73.4%, 81.2%)

CMYK0%, 73.4%, 69.1%, 18.8%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer13,580,096

CSS custom property--colour: #CF3740;

Brightness & contrast

Relative luminance0.16368WCAG 2.x, 0 is black and 1 is white

Perceived brightness122.7 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 4.91:1

Contrast with white4.91:1WCAG normal text: AA

Contrast with black4.27:1WCAG normal text: Fail

Greyscale equivalent#585858

Inverted#30C8BF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#635C3Fno red cones; affects about 1% of men; ΔE 63.4 from the original

Deuteranopia#897C3Bno green cones; the most common form, about 1% of men; ΔE 63.5 from the original

Tritanopia#E3003Cno blue cones; rare, and affects men and women equally; ΔE 15.7 from the original

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

Contrast with white, large text4.91:1WCAG large text: AAA

Contrast with black, large text4.27:1WCAG large text: AA

Named colours

Firebrick · ΔE 11.1 Crimson · ΔE 11.9 Brown · ΔE 13.8 Indian red · ΔE 18 Tomato · ΔE 21.3 Dark red · ΔE 23.4

Nearest named CSS colourFirebrick (#B22222)ΔE 11.12, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#37CFC6

Analogous#CF378C, #CF7A37

Triadic#40CF37, #3740CF

Split complementary#37CF7A, #378CCF

Tetradic#8CCF37, #37CFC6, #7A37CF

Tints, shades & saturation

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

Lighter +40%#F6DCDD

Lighter +30%#EDB2B6

Lighter +20%#E3898F

Lighter +10%#D96067

Darker −10%#AA2930

Darker −20%#811F25

Darker −30%#581519

Darker −40%#2F0B0D

More saturated +25%#EE1825

Less saturated −25%#B0565B

Channel breakdown

R207

G55

B64

Red207 (81.2%)

Green55 (21.6%)

Blue64 (25.1%)

Hue356.45°

Saturation (HSL)61.29%

Lightness51.37%

Dominant channelRed

Hex per channelR CF · G 37 · B 40

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Harmonies

Lighter and darker

Similar named colours

Also reads as

CF3740 (chemical formula)

Formula
71,064.531 g/mol
3741 atoms

CF3740 has a molar mass of 71,064.531 g/mol, made up of 3741 atoms across 2 elements: 1 × C, 3740 × F.

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Molar mass

Molar mass71,064.531 g/mol

Total atoms per molecule3741

Distinct elements2

Mass of one molecule1.1800543 × 10^-19 g

Molecules per gram8.4741863 × 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

C0%

F100%

Carbon (C)12.011 g/mol, 0.017%

Fluorine (F × 3740)71,052.52 g/mol, 99.983%

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