Recognised as Colour

#B52009

#B52009
Red
Dark
Nearest: Firebrick

#B52009 is a red with RGB values 181, 32, 9 and HSL 8°, 91%, 37%. 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

#B52009#B52009

HEX#B52009

RGBrgb(181, 32, 9)

RGB (0–1)0.7098, 0.1255, 0.0353

RGB percentages71%, 12.5%, 3.5%

HSLhsl(8, 90.5%, 37.3%)

HSV / HSBhsv(8, 95%, 71%)

CMYK0%, 82.3%, 95%, 29%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,870,217

CSS custom property--colour: #B52009;

Brightness & contrast

Relative luminance0.10877WCAG 2.x, 0 is black and 1 is white

Perceived brightness102 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.61:1

Contrast with white6.61:1WCAG normal text: AA

Contrast with black3.18:1WCAG normal text: Fail

Greyscale equivalent#3E3E3E

Inverted#4ADFF6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#524801no red cones; affects about 1% of men; ΔE 61.9 from the original

Deuteranopia#766800no green cones; the most common form, about 1% of men; ΔE 61.3 from the original

Tritanopia#C8001Eno blue cones; rare, and affects men and women equally; ΔE 11.9 from the original

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

Contrast with white, large text6.61:1WCAG large text: AAA

Contrast with black, large text3.18:1WCAG large text: AA

Named colours

Firebrick · ΔE 11.9 Dark red · ΔE 15.1 Maroon · ΔE 20 Brown · ΔE 20.3 Crimson · ΔE 22.6 Tomato · ΔE 23.1

Nearest named CSS colourFirebrick (#B22222)ΔE 11.86, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#099EB5

Analogous#B50948, #B57609

Triadic#09B520, #2009B5

Split complementary#09B576, #0948B5

Tetradic#48B509, #099EB5, #7609B5

Tints, shades & saturation

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

Lighter +40%#FA9F90

Lighter +30%#F77460

Lighter +20%#F54A2F

Lighter +10%#E6290B

Darker −10%#841707

Darker −20%#540F04

Darker −30%#230602

Darker −40%#000000

More saturated +25%#BE1900

Less saturated −25%#9D3121

Channel breakdown

R181

G32

Red181 (71%)

Green32 (12.5%)

Blue9 (3.5%)

Hue8.02°

Saturation (HSL)90.53%

Lightness37.25%

Dominant channelRed

Hex per channelR B5 · G 20 · B 09

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B52009 (chemical formula)

Formula
562,217.29 g/mol
52009 atoms

B52009 has a molar mass of 562,217.29 g/mol, made up of 52009 atoms across 1 element: 52009 × B.

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Molar mass

Molar mass562,217.29 g/mol

Total atoms per molecule52009

Distinct elements1

Mass of one molecule9.3358377 × 10^-19 g

Molecules per gram1.0711412 × 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 × 52009)562,217.29 g/mol, 100%

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Elements in this formula

Boron

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