Recognised as Colour

#B31819

#B31819
Red
Dark
Nearest: Firebrick

#B31819 is a red with RGB values 179, 24, 25 and HSL 360°, 76%, 40%. It is a dark colour, so white text on it reaches 6.9:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#B31819#B31819

HEX#B31819

RGBrgb(179, 24, 25)

RGB (0–1)0.702, 0.0941, 0.098

RGB percentages70.2%, 9.4%, 9.8%

HSLhsl(359.6, 76.4%, 39.8%)

HSV / HSBhsv(359.6, 86.6%, 70.2%)

CMYK0%, 86.6%, 86%, 29.8%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,737,113

CSS custom property--colour: #B31819;

Brightness & contrast

Relative luminance0.10307WCAG 2.x, 0 is black and 1 is white

Perceived brightness99.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.86:1

Contrast with white6.86:1WCAG normal text: AA

Contrast with black3.06:1WCAG normal text: Fail

Greyscale equivalent#393939

Inverted#4CE7E6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4E4516no red cones; affects about 1% of men; ΔE 63.1 from the original

Deuteranopia#73660Eno green cones; the most common form, about 1% of men; ΔE 63 from the original

Tritanopia#C6001Cno blue cones; rare, and affects men and women equally; ΔE 9.1 from the original

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

Contrast with white, large text6.86:1WCAG large text: AAA

Contrast with black, large text3.06:1WCAG large text: AA

Named colours

Firebrick · ΔE 4.9 Dark red · ΔE 12.7 Brown · ΔE 14.3 Maroon · ΔE 16.9 Crimson · ΔE 17.3 Tomato · ΔE 24.2

Nearest named CSS colourFirebrick (#B22222)ΔE 4.94, a close match

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#18B3B2

Analogous#B31866, #B36518

Triadic#19B318, #1819B3

Split complementary#18B365, #1866B3

Tetradic#66B318, #18B3B2, #6518B3

Tints, shades & saturation

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

Lighter +40%#F3A4A5

Lighter +30%#ED7778

Lighter +20%#E74A4B

Lighter +10%#E01E1F

Darker −10%#861213

Darker −20%#590C0C

Darker −30%#2C0606

Darker −40%#000000

More saturated +25%#CB0001

Less saturated −25%#9A3132

Channel breakdown

R179

G24

B25

Red179 (70.2%)

Green24 (9.4%)

Blue25 (9.8%)

Hue359.61°

Saturation (HSL)76.35%

Lightness39.8%

Dominant channelRed

Hex per channelR B3 · G 18 · B 19

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B31819 (chemical formula)

Formula
343,963.39 g/mol
31819 atoms

B31819 has a molar mass of 343,963.39 g/mol, made up of 31819 atoms across 1 element: 31819 × B.

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Molar mass

Molar mass343,963.39 g/mol

Total atoms per molecule31819

Distinct elements1

Mass of one molecule5.7116465 × 10^-19 g

Molecules per gram1.7508086 × 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

B100%

Boron (B × 31819)343,963.39 g/mol, 100%

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Elements in this formula

Boron

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