Recognised as Colour

#BB3937

#BB3937
Red
Dark
Nearest: Brown

#BB3937 is a red with RGB values 187, 57, 55 and HSL 1°, 55%, 47%. It is a dark colour, so white text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Brown.

Colour values

#BB3937#BB3937

HEX#BB3937

RGBrgb(187, 57, 55)

RGB (0–1)0.7333, 0.2235, 0.2157

RGB percentages73.3%, 22.4%, 21.6%

HSLhsl(0.9, 54.5%, 47.5%)

HSV / HSBhsv(0.9, 70.6%, 73.3%)

CMYK0%, 69.5%, 70.6%, 26.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,269,879

CSS custom property--colour: #BB3937;

Brightness & contrast

Relative luminance0.13767WCAG 2.x, 0 is black and 1 is white

Perceived brightness112.7 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 5.59:1

Contrast with white5.59:1WCAG normal text: AA

Contrast with black3.75:1WCAG normal text: Fail

Greyscale equivalent#545454

Inverted#44C6C8

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#5E5636no red cones; affects about 1% of men; ΔE 55.5 from the original

Deuteranopia#7E7233no green cones; the most common form, about 1% of men; ΔE 56 from the original

Tritanopia#CE0F3Ano blue cones; rare, and affects men and women equally; ΔE 16.2 from the original

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

Contrast with white, large text5.59:1WCAG large text: AAA

Contrast with black, large text3.75:1WCAG large text: AA

Named colours

Brown · ΔE 6.8 Firebrick · ΔE 9 Indian red · ΔE 14.9 Dark red · ΔE 18.7 Crimson · ΔE 19.5 Maroon · ΔE 19.9

Nearest named CSS colourBrown (#A52A2A)ΔE 6.75, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#37B9BB

Analogous#BB3777, #BB7B37

Triadic#37BB39, #3937BB

Split complementary#37BB7B, #3777BB

Tetradic#77BB37, #37B9BB, #7B37BB

Tints, shades & saturation

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

Lighter +40%#F0CECE

Lighter +30%#E5A7A6

Lighter +20%#D9807F

Lighter +10%#CE5957

Darker −10%#942D2B

Darker −20%#6C2120

Darker −30%#451514

Darker −40%#1D0909

More saturated +25%#D91C19

Less saturated −25%#9D5655

Channel breakdown

R187

G57

B55

Red187 (73.3%)

Green57 (22.4%)

Blue55 (21.6%)

Hue0.91°

Saturation (HSL)54.55%

Lightness47.45%

Dominant channelRed

Hex per channelR BB · G 39 · B 37

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Harmonies

Lighter and darker

Similar named colours

Also reads as

BB3937 (chemical formula)

Formula
42,569.78 g/mol
3938 atoms

BB3937 has a molar mass of 42,569.78 g/mol, made up of 3938 atoms across 1 element: 3938 × B.

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Molar mass

Molar mass42,569.78 g/mol

Total atoms per molecule3938

Distinct elements1

Mass of one molecule7.0688783 × 10^-20 g

Molecules per gram1.4146516 × 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 × 3938)42,569.78 g/mol, 100%

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Elements in this formula

Boron

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