Recognised as Colour

#B10020

#B10020
Red
Dark
Nearest: Firebrick

#B10020 is a red with RGB values 177, 0, 32 and HSL 349°, 100%, 35%. It is a dark colour, so white text on it reaches 7.3:1 contrast (AAA for normal text). The nearest named colour is Firebrick.

Colour values

#B10020#B10020

HEX#B10020

RGBrgb(177, 0, 32)

RGB (0–1)0.6941, 0, 0.1255

RGB percentages69.4%, 0%, 12.5%

HSLhsl(349.2, 100%, 34.7%)

HSV / HSBhsv(349.2, 100%, 69.4%)

CMYK0%, 100%, 81.9%, 30.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,599,904

CSS custom property--colour: #B10020;

Brightness & contrast

Relative luminance0.09451WCAG 2.x, 0 is black and 1 is white

Perceived brightness97.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 7.27:1

Contrast with white7.27:1WCAG normal text: AAA

Contrast with black2.89:1WCAG normal text: Fail

Greyscale equivalent#282828

Inverted#4EFFDF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#48401Fno red cones; affects about 1% of men; ΔE 65.7 from the original

Deuteranopia#6F6317no green cones; the most common form, about 1% of men; ΔE 66 from the original

Tritanopia#C40013no blue cones; rare, and affects men and women equally; ΔE 13.2 from the original

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

Contrast with white, large text7.27:1WCAG large text: AAA

Contrast with black, large text2.89:1WCAG large text: Fail

Named colours

Firebrick · ΔE 6.1 Brown · ΔE 13.2 Crimson · ΔE 14.2 Dark red · ΔE 14.5 Maroon · ΔE 17.6 Indian red · ΔE 27.5

Nearest named CSS colourFirebrick (#B22222)ΔE 6.09, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00B191

Analogous#B10078, #B13900

Triadic#20B100, #0020B1

Split complementary#00B139, #0078B1

Tetradic#78B100, #00B191, #3900B1

Tints, shades & saturation

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

Lighter +40%#FF7E95

Lighter +30%#FF4B6C

Lighter +20%#FF1842

Lighter +10%#E40029

Darker −10%#7E0017

Darker −20%#4B000E

Darker −30%#180004

Darker −40%#000000

More saturated +25%#B10020

Less saturated −25%#9B162E

Channel breakdown

R177

B32

Red177 (69.4%)

Green0 (0%)

Blue32 (12.5%)

Hue349.15°

Saturation (HSL)100%

Lightness34.71%

Dominant channelRed

Hex per channelR B1 · G 00 · B 20

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B10020 (chemical formula)

Formula
108,316.2 g/mol
10020 atoms

B10020 has a molar mass of 108,316.2 g/mol, made up of 10020 atoms across 1 element: 10020 × B.

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Molar mass

Molar mass108,316.2 g/mol

Total atoms per molecule10020

Distinct elements1

Mass of one molecule1.7986328 × 10^-19 g

Molecules per gram5.5597785 × 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 × 10020)108,316.2 g/mol, 100%

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Elements in this formula

Boron

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