Recognised as Colour

#B50209

#B50209
Red
Dark
Nearest: Firebrick

#B50209 is a red with RGB values 181, 2, 9 and HSL 358°, 98%, 36%. It is a dark colour, so white text on it reaches 7.1:1 contrast (AAA for normal text). The nearest named colour is Firebrick.

Colour values

#B50209#B50209

HEX#B50209

RGBrgb(181, 2, 9)

RGB (0–1)0.7098, 0.0078, 0.0353

RGB percentages71%, 0.8%, 3.5%

HSLhsl(357.7, 97.8%, 35.9%)

HSV / HSBhsv(357.7, 98.9%, 71%)

CMYK0%, 98.9%, 95%, 29%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,862,537

CSS custom property--colour: #B50209;

Brightness & contrast

Relative luminance0.09887WCAG 2.x, 0 is black and 1 is white

Perceived brightness99 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 7.05:1

Contrast with white7.05:1WCAG normal text: AAA

Contrast with black2.98:1WCAG normal text: Fail

Greyscale equivalent#292929

Inverted#4AFDF6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4B4103no red cones; affects about 1% of men; ΔE 66.6 from the original

Deuteranopia#726500no green cones; the most common form, about 1% of men; ΔE 66.6 from the original

Tritanopia#C8000Bno blue cones; rare, and affects men and women equally; ΔE 7.5 from the original

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

Contrast with white, large text7.05:1WCAG large text: AAA

Contrast with black, large text2.98:1WCAG large text: Fail

Named colours

Firebrick · ΔE 12.4 Dark red · ΔE 16.1 Crimson · ΔE 19.8 Maroon · ΔE 21.1 Brown · ΔE 21.6 Tomato · ΔE 25

Nearest named CSS colourFirebrick (#B22222)ΔE 12.41, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#02B5AE

Analogous#B50263, #B55402

Triadic#09B502, #0209B5

Split complementary#02B554, #0263B5

Tetradic#63B502, #02B5AE, #5402B5

Tints, shades & saturation

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

Lighter +40%#FE858A

Lighter +30%#FD535A

Lighter +20%#FD2029

Lighter +10%#E7030C

Darker −10%#830106

Darker −20%#500104

Darker −30%#1E0001

Darker −40%#000000

More saturated +25%#B70007

Less saturated −25%#9E191E

Channel breakdown

R181

Red181 (71%)

Green2 (0.8%)

Blue9 (3.5%)

Hue357.65°

Saturation (HSL)97.81%

Lightness35.88%

Dominant channelRed

Hex per channelR B5 · G 02 · B 09

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B50209 (chemical formula)

Formula
542,759.29 g/mol
50209 atoms

B50209 has a molar mass of 542,759.29 g/mol, made up of 50209 atoms across 1 element: 50209 × B.

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Molar mass

Molar mass542,759.29 g/mol

Total atoms per molecule50209

Distinct elements1

Mass of one molecule9.0127301 × 10^-19 g

Molecules per gram1.1095417 × 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 × 50209)542,759.29 g/mol, 100%

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Elements in this formula

Boron

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