Recognised as Colour

#B5041B

#B5041B
Red
Dark
Nearest: Firebrick

#B5041B is a red with RGB values 181, 4, 27 and HSL 352°, 96%, 36%. 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

#B5041B#B5041B

HEX#B5041B

RGBrgb(181, 4, 27)

RGB (0–1)0.7098, 0.0157, 0.1059

RGB percentages71%, 1.6%, 10.6%

HSLhsl(352.2, 95.7%, 36.3%)

HSV / HSBhsv(352.2, 97.8%, 71%)

CMYK0%, 97.8%, 85.1%, 29%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,863,067

CSS custom property--colour: #B5041B;

Brightness & contrast

Relative luminance0.0999WCAG 2.x, 0 is black and 1 is white

Perceived brightness99.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 7:1

Contrast with white7:1WCAG normal text: AAA

Contrast with black3:1WCAG normal text: Fail

Greyscale equivalent#2B2B2B

Inverted#4AFBE4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4A4219no red cones; affects about 1% of men; ΔE 66.8 from the original

Deuteranopia#726510no green cones; the most common form, about 1% of men; ΔE 66.4 from the original

Tritanopia#C80013no blue cones; rare, and affects men and women equally; ΔE 10.8 from the original

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

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

Contrast with black, large text3:1WCAG large text: Fail

Named colours

Firebrick · ΔE 6.7 Dark red · ΔE 14.6 Crimson · ΔE 14.6 Brown · ΔE 15.7 Maroon · ΔE 18.7 Tomato · ΔE 25.4

Nearest named CSS colourFirebrick (#B22222)ΔE 6.71, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#04B59E

Analogous#B50473, #B54504

Triadic#1BB504, #041BB5

Split complementary#04B545, #0473B5

Tetradic#74B504, #04B59E, #4604B5

Tints, shades & saturation

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

Lighter +40%#FC8998

Lighter +30%#FB576C

Lighter +20%#FA2541

Lighter +10%#E70522

Darker −10%#830314

Darker −20%#51020C

Darker −30%#1F0105

Darker −40%#000000

More saturated +25%#B90018

Less saturated −25%#9E1B2C

Channel breakdown

R181

B27

Red181 (71%)

Green4 (1.6%)

Blue27 (10.6%)

Hue352.2°

Saturation (HSL)95.68%

Lightness36.27%

Dominant channelRed

Hex per channelR B5 · G 04 · B 1B

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B5041B (chemical formula)

Formula
54,504.02 g/mol
5042 atoms

B5041B has a molar mass of 54,504.02 g/mol, made up of 5042 atoms across 1 element: 5042 × B.

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Molar mass

Molar mass54,504.02 g/mol

Total atoms per molecule5042

Distinct elements1

Mass of one molecule9.0506055 × 10^-20 g

Molecules per gram1.1048985 × 10^19

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 × 5042)54,504.02 g/mol, 100%

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Elements in this formula

Boron

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