Recognised as Colour

#B72931

#B72931
Red
Dark
Nearest: Firebrick

#B72931 is a red with RGB values 183, 41, 49 and HSL 357°, 63%, 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 Firebrick.

Colour values

#B72931#B72931

HEX#B72931

RGBrgb(183, 41, 49)

RGB (0–1)0.7176, 0.1608, 0.1922

RGB percentages71.8%, 16.1%, 19.2%

HSLhsl(356.6, 63.4%, 43.9%)

HSV / HSBhsv(356.6, 77.6%, 71.8%)

CMYK0%, 77.6%, 73.2%, 28.2%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,003,633

CSS custom property--colour: #B72931;

Brightness & contrast

Relative luminance0.11875WCAG 2.x, 0 is black and 1 is white

Perceived brightness106.2 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 black3.37:1WCAG normal text: Fail

Greyscale equivalent#484848

Inverted#48D6CE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#544D30no red cones; affects about 1% of men; ΔE 59.9 from the original

Deuteranopia#776C2Cno green cones; the most common form, about 1% of men; ΔE 60.5 from the original

Tritanopia#C9002Eno blue cones; rare, and affects men and women equally; ΔE 12.6 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 text3.37:1WCAG large text: AA

Named colours

Firebrick · ΔE 6.6 Brown · ΔE 7.2 Crimson · ΔE 16.3 Dark red · ΔE 17.1 Maroon · ΔE 18.6 Indian red · ΔE 19

Nearest named CSS colourFirebrick (#B22222)ΔE 6.64, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#29B7AF

Analogous#B72978, #B76829

Triadic#31B729, #2931B7

Split complementary#29B768, #2978B7

Tetradic#78B729, #29B7AF, #6829B7

Tints, shades & saturation

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

Lighter +40%#F0BCBF

Lighter +30%#E79297

Lighter +20%#DD696F

Lighter +10%#D43F47

Darker −10%#8D2026

Darker −20%#64161B

Darker −30%#3A0D10

Darker −40%#100404

More saturated +25%#D30D18

Less saturated −25%#9B454A

Channel breakdown

R183

G41

B49

Red183 (71.8%)

Green41 (16.1%)

Blue49 (19.2%)

Hue356.62°

Saturation (HSL)63.39%

Lightness43.92%

Dominant channelRed

Hex per channelR B7 · G 29 · B 31

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B72931 (chemical formula)

Formula
788,384.11 g/mol
72931 atoms

B72931 has a molar mass of 788,384.11 g/mol, made up of 72931 atoms across 1 element: 72931 × B.

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Molar mass

Molar mass788,384.11 g/mol

Total atoms per molecule72931

Distinct elements1

Mass of one molecule1.3091426 × 10^-18 g

Molecules per gram7.6385872 × 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 × 72931)788,384.11 g/mol, 100%

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Elements in this formula

Boron

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