Recognised as Colour

#B71831

#B71831
Red
Dark
Nearest: Firebrick

#B71831 is a red with RGB values 183, 24, 49 and HSL 351°, 77%, 41%. It is a dark colour, so white text on it reaches 6.6:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#B71831#B71831

HEX#B71831

RGBrgb(183, 24, 49)

RGB (0–1)0.7176, 0.0941, 0.1922

RGB percentages71.8%, 9.4%, 19.2%

HSLhsl(350.6, 76.8%, 40.6%)

HSV / HSBhsv(350.6, 86.9%, 71.8%)

CMYK0%, 86.9%, 73.2%, 28.2%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,999,281

CSS custom property--colour: #B71831;

Brightness & contrast

Relative luminance0.10942WCAG 2.x, 0 is black and 1 is white

Perceived brightness103.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.59:1

Contrast with white6.59:1WCAG normal text: AA

Contrast with black3.19:1WCAG normal text: Fail

Greyscale equivalent#3C3C3C

Inverted#48E7CE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4E4830no red cones; affects about 1% of men; ΔE 64.2 from the original

Deuteranopia#74692Bno green cones; the most common form, about 1% of men; ΔE 64.7 from the original

Tritanopia#CA0024no blue cones; rare, and affects men and women equally; ΔE 14.3 from the original

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

Contrast with white, large text6.59:1WCAG large text: AAA

Contrast with black, large text3.19:1WCAG large text: AA

Named colours

Firebrick · ΔE 9.2 Brown · ΔE 10.8 Crimson · ΔE 13.7 Dark red · ΔE 18.8 Maroon · ΔE 20.4 Indian red · ΔE 22

Nearest named CSS colourFirebrick (#B22222)ΔE 9.23, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#18B79E

Analogous#B71881, #B74F18

Triadic#31B718, #1831B7

Split complementary#18B74F, #1881B7

Tetradic#80B718, #18B79E, #4E18B7

Tints, shades & saturation

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

Lighter +40%#F4A7B3

Lighter +30%#EE7A8D

Lighter +20%#E84D66

Lighter +10%#E2203F

Darker −10%#8A1225

Darker −20%#5D0C19

Darker −30%#30060D

Darker −40%#030001

More saturated +25%#CF0021

Less saturated −25%#9D3243

Channel breakdown

R183

G24

B49

Red183 (71.8%)

Green24 (9.4%)

Blue49 (19.2%)

Hue350.57°

Saturation (HSL)76.81%

Lightness40.59%

Dominant channelRed

Hex per channelR B7 · G 18 · B 31

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B71831 (chemical formula)

Formula
776,493.11 g/mol
71831 atoms

B71831 has a molar mass of 776,493.11 g/mol, made up of 71831 atoms across 1 element: 71831 × B.

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Molar mass

Molar mass776,493.11 g/mol

Total atoms per molecule71831

Distinct elements1

Mass of one molecule1.2893971 × 10^-18 g

Molecules per gram7.7555624 × 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 × 71831)776,493.11 g/mol, 100%

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Elements in this formula

Boron

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