Recognised as Colour

#B4372B

#B4372B
Red
Dark
Nearest: Brown

#B4372B is a red with RGB values 180, 55, 43 and HSL 5°, 61%, 44%. It is a dark colour, so white text on it reaches 6:1 contrast (AA for normal text). The nearest named colour is Brown.

Colour values

#B4372B#B4372B

HEX#B4372B

RGBrgb(180, 55, 43)

RGB (0–1)0.7059, 0.2157, 0.1686

RGB percentages70.6%, 21.6%, 16.9%

HSLhsl(5.3, 61.4%, 43.7%)

HSV / HSBhsv(5.3, 76.1%, 70.6%)

CMYK0%, 69.4%, 76.1%, 29.4%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,810,603

CSS custom property--colour: #B4372B;

Brightness & contrast

Relative luminance0.1261WCAG 2.x, 0 is black and 1 is white

Perceived brightness108 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 5.96:1

Contrast with white5.96:1WCAG normal text: AA

Contrast with black3.52:1WCAG normal text: Fail

Greyscale equivalent#515151

Inverted#4BC8D4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#5B5229no red cones; affects about 1% of men; ΔE 53.8 from the original

Deuteranopia#7A6E26no green cones; the most common form, about 1% of men; ΔE 54.5 from the original

Tritanopia#C60B35no blue cones; rare, and affects men and women equally; ΔE 17.3 from the original

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

Contrast with white, large text5.96:1WCAG large text: AAA

Contrast with black, large text3.52:1WCAG large text: AA

Named colours

Brown · ΔE 7.1 Firebrick · ΔE 7.1 Dark red · ΔE 15.1 Maroon · ΔE 16.9 Indian red · ΔE 18.4 Sienna · ΔE 20.5

Nearest named CSS colourBrown (#A52A2A)ΔE 7.1, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#2BA8B4

Analogous#B42B64, #B47B2B

Triadic#2BB437, #372BB4

Split complementary#2BB47B, #2B64B4

Tetradic#64B42B, #2BA8B4, #7B2BB4

Tints, shades & saturation

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

Lighter +40%#EFC0BC

Lighter +30%#E59A93

Lighter +20%#DB746A

Lighter +10%#D14D41

Darker −10%#8B2A21

Darker −20%#621E17

Darker −30%#39110D

Darker −40%#0F0504

More saturated +25%#D0200F

Less saturated −25%#984E47

Channel breakdown

R180

G55

B43

Red180 (70.6%)

Green55 (21.6%)

Blue43 (16.9%)

Hue5.26°

Saturation (HSL)61.43%

Lightness43.73%

Dominant channelRed

Hex per channelR B4 · G 37 · B 2B

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B4372B (chemical formula)

Formula
47,272.13 g/mol
4373 atoms

B4372B has a molar mass of 47,272.13 g/mol, made up of 4373 atoms across 1 element: 4373 × B.

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Molar mass

Molar mass47,272.13 g/mol

Total atoms per molecule4373

Distinct elements1

Mass of one molecule7.8497219 × 10^-20 g

Molecules per gram1.2739305 × 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 × 4373)47,272.13 g/mol, 100%

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Elements in this formula

Boron

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