Recognised as Colour

#CF370B

#CF370B
Red
Dark
Nearest: Tomato

#CF370B is a red with RGB values 207, 55, 11 and HSL 13°, 90%, 43%. It is a dark colour, so white text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Tomato.

Colour values

#CF370B#CF370B

HEX#CF370B

RGBrgb(207, 55, 11)

RGB (0–1)0.8118, 0.2157, 0.0431

RGB percentages81.2%, 21.6%, 4.3%

HSLhsl(13.5, 89.9%, 42.7%)

HSV / HSBhsv(13.5, 94.7%, 81.2%)

CMYK0%, 73.4%, 94.7%, 18.8%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer13,580,043

CSS custom property--colour: #CF370B;

Brightness & contrast

Relative luminance0.16022WCAG 2.x, 0 is black and 1 is white

Perceived brightness120.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 4.99:1

Contrast with white4.99:1WCAG normal text: AA

Contrast with black4.2:1WCAG normal text: Fail

Greyscale equivalent#545454

Inverted#30C8F4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#675A00no red cones; affects about 1% of men; ΔE 62.8 from the original

Deuteranopia#8C7C00no green cones; the most common form, about 1% of men; ΔE 63 from the original

Tritanopia#E50031no blue cones; rare, and affects men and women equally; ΔE 22.1 from the original

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

Contrast with white, large text4.99:1WCAG large text: AAA

Contrast with black, large text4.2:1WCAG large text: AA

Named colours

Tomato · ΔE 18 Orange red · ΔE 19.5 Firebrick · ΔE 20.1 Chocolate · ΔE 22.6 Dark red · ΔE 24.9 Coral · ΔE 25.3

Nearest named CSS colourTomato (#FF6347)ΔE 17.99, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#0BA3CF

Analogous#CF0B41, #CF990B

Triadic#0BCF37, #370BCF

Split complementary#0BCF99, #0B41CF

Tetradic#41CF0B, #0BA3CF, #990BCF

Tints, shades & saturation

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

Lighter +40%#FBBDAB

Lighter +30%#F8977B

Lighter +20%#F5714B

Lighter +10%#F34B1A

Darker −10%#9F2A08

Darker −20%#6E1D06

Darker −30%#3E1003

Darker −40%#0D0401

More saturated +25%#DA3100

Less saturated −25%#B44626

Channel breakdown

R207

G55

B11

Red207 (81.2%)

Green55 (21.6%)

Blue11 (4.3%)

Hue13.47°

Saturation (HSL)89.91%

Lightness42.75%

Dominant channelRed

Hex per channelR CF · G 37 · B 0B

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Harmonies

Lighter and darker

Similar named colours

Also reads as

CF370B (chemical formula)

Formula
7,052.081 g/mol
372 atoms

CF370B has a molar mass of 7,052.081 g/mol, made up of 372 atoms across 3 elements: 1 × C, 370 × F, 1 × B.

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Molar mass

Molar mass7,052.081 g/mol

Total atoms per molecule372

Distinct elements3

Mass of one molecule1.1710256 × 10^-20 g

Molecules per gram8.539523 × 10^19

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

C0.2%

F99.7%

B0.2%

Carbon (C)12.011 g/mol, 0.17%

Fluorine (F × 370)7,029.26 g/mol, 99.676%

Boron (B)10.81 g/mol, 0.153%

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