Recognised as Colour

#B50019

#B50019
Red
Dark
Nearest: Firebrick

#B50019 is a red with RGB values 181, 0, 25 and HSL 352°, 100%, 35%. It is a dark colour, so white text on it reaches 7:1 contrast (AAA for normal text). The nearest named colour is Firebrick.

Colour values

#B50019#B50019

HEX#B50019

RGBrgb(181, 0, 25)

RGB (0–1)0.7098, 0, 0.098

RGB percentages71%, 0%, 9.8%

HSLhsl(351.7, 100%, 35.5%)

HSV / HSBhsv(351.7, 100%, 71%)

CMYK0%, 100%, 86.2%, 29%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,862,041

CSS custom property--colour: #B50019;

Brightness & contrast

Relative luminance0.09894WCAG 2.x, 0 is black and 1 is white

Perceived brightness99.3 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#282828

Inverted#4AFFE6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4A4217no red cones; affects about 1% of men; ΔE 67.3 from the original

Deuteranopia#72650Dno green cones; the most common form, about 1% of men; ΔE 66.9 from the original

Tritanopia#C80010no blue cones; rare, and affects men and women equally; ΔE 10.9 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 7.5 Dark red · ΔE 14.8 Crimson · ΔE 15 Brown · ΔE 16.6 Maroon · ΔE 19 Tomato · ΔE 25.4

Nearest named CSS colourFirebrick (#B22222)ΔE 7.52, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00B59C

Analogous#B50074, #B54200

Triadic#19B500, #0019B5

Split complementary#00B542, #0074B5

Tetradic#73B500, #00B59C, #4100B5

Tints, shades & saturation

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

Lighter +40%#FF8293

Lighter +30%#FF4F67

Lighter +20%#FF1C3B

Lighter +10%#E80020

Darker −10%#820012

Darker −20%#4F000B

Darker −30%#1C0004

Darker −40%#000000

More saturated +25%#B50019

Less saturated −25%#9E1729

Channel breakdown

R181

B25

Red181 (71%)

Green0 (0%)

Blue25 (9.8%)

Hue351.71°

Saturation (HSL)100%

Lightness35.49%

Dominant channelRed

Hex per channelR B5 · G 00 · B 19

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B50019 (chemical formula)

Formula
540,705.39 g/mol
50019 atoms

B50019 has a molar mass of 540,705.39 g/mol, made up of 50019 atoms across 1 element: 50019 × B.

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Molar mass

Molar mass540,705.39 g/mol

Total atoms per molecule50019

Distinct elements1

Mass of one molecule8.9786242 × 10^-19 g

Molecules per gram1.1137564 × 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 × 50019)540,705.39 g/mol, 100%

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Elements in this formula

Boron

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