Recognised as Colour

#B72839

#B72839
Red
Dark
Nearest: Brown

#B72839 is a red with RGB values 183, 40, 57 and HSL 353°, 64%, 44%. It is a dark colour, so white text on it reaches 6.2:1 contrast (AA for normal text). The nearest named colour is Brown.

Colour values

#B72839#B72839

HEX#B72839

RGBrgb(183, 40, 57)

RGB (0–1)0.7176, 0.1569, 0.2235

RGB percentages71.8%, 15.7%, 22.4%

HSLhsl(352.9, 64.1%, 43.7%)

HSV / HSBhsv(352.9, 78.1%, 71.8%)

CMYK0%, 78.1%, 68.9%, 28.2%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,003,385

CSS custom property--colour: #B72839;

Brightness & contrast

Relative luminance0.1188WCAG 2.x, 0 is black and 1 is white

Perceived brightness106.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.22:1

Contrast with white6.22:1WCAG normal text: AA

Contrast with black3.38:1WCAG normal text: Fail

Greyscale equivalent#484848

Inverted#48D7C6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#534D38no red cones; affects about 1% of men; ΔE 59.9 from the original

Deuteranopia#776C34no green cones; the most common form, about 1% of men; ΔE 60.6 from the original

Tritanopia#C90030no blue cones; rare, and affects men and women equally; ΔE 13.7 from the original

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

Contrast with white, large text6.22:1WCAG large text: AAA

Contrast with black, large text3.38:1WCAG large text: AA

Named colours

Brown · ΔE 8.8 Firebrick · ΔE 11.4 Crimson · ΔE 17.1 Indian red · ΔE 17.6 Dark red · ΔE 20.5 Maroon · ΔE 21.2

Nearest named CSS colourBrown (#A52A2A)ΔE 8.76, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#28B7A6

Analogous#B72881, #B75E28

Triadic#39B728, #2839B7

Split complementary#28B75E, #2881B7

Tetradic#81B728, #28B7A6, #5E28B7

Tints, shades & saturation

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

Lighter +40%#F0BBC1

Lighter +30%#E7919B

Lighter +20%#DE6775

Lighter +10%#D53D4F

Darker −10%#8D1F2C

Darker −20%#63161F

Darker −30%#390D12

Darker −40%#100305

More saturated +25%#D30C24

Less saturated −25%#9B444E

Channel breakdown

R183

G40

B57

Red183 (71.8%)

Green40 (15.7%)

Blue57 (22.4%)

Hue352.87°

Saturation (HSL)64.13%

Lightness43.73%

Dominant channelRed

Hex per channelR B7 · G 28 · B 39

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B72839 (chemical formula)

Formula
787,389.59 g/mol
72839 atoms

B72839 has a molar mass of 787,389.59 g/mol, made up of 72839 atoms across 1 element: 72839 × B.

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Molar mass

Molar mass787,389.59 g/mol

Total atoms per molecule72839

Distinct elements1

Mass of one molecule1.3074912 × 10^-18 g

Molecules per gram7.6482352 × 10^17

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

B100%

Boron (B × 72839)787,389.59 g/mol, 100%

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Elements in this formula

Boron

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