Recognised as Colour

#BB4740

#BB4740
Red
Dark
Nearest: Brown

#BB4740 is a red with RGB values 187, 71, 64 and HSL 3°, 49%, 49%. It is a dark colour, so white text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Brown.

Colour values

#BB4740#BB4740

HEX#BB4740

RGBrgb(187, 71, 64)

RGB (0–1)0.7333, 0.2784, 0.251

RGB percentages73.3%, 27.8%, 25.1%

HSLhsl(3.4, 49%, 49.2%)

HSV / HSBhsv(3.4, 65.8%, 73.3%)

CMYK0%, 62%, 65.8%, 26.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,273,472

CSS custom property--colour: #BB4740;

Brightness & contrast

Relative luminance0.15441WCAG 2.x, 0 is black and 1 is white

Perceived brightness117.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 5.14:1

Contrast with white5.14:1WCAG normal text: AA

Contrast with black4.09:1WCAG normal text: Fail

Greyscale equivalent#5F5F5F

Inverted#44B8BF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#655E3Fno red cones; affects about 1% of men; ΔE 50.2 from the original

Deuteranopia#82773Dno green cones; the most common form, about 1% of men; ΔE 50.7 from the original

Tritanopia#CD2E46no blue cones; rare, and affects men and women equally; ΔE 15.8 from the original

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

Contrast with white, large text5.14:1WCAG large text: AAA

Contrast with black, large text4.09:1WCAG large text: AA

Named colours

Brown · ΔE 9.5 Indian red · ΔE 9.9 Firebrick · ΔE 14.9 Sienna · ΔE 18.5 Salmon · ΔE 21.1 Light coral · ΔE 22.2

Nearest named CSS colourBrown (#A52A2A)ΔE 9.5, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#40B4BB

Analogous#BB4076, #BB8540

Triadic#40BB47, #4740BB

Split complementary#40BB84, #4077BB

Tetradic#76BB40, #40B4BB, #8540BB

Tints, shades & saturation

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

Lighter +40%#F1D8D6

Lighter +30%#E4B3B0

Lighter +20%#D78E8A

Lighter +10%#CA6A64

Darker −10%#953933

Darker −20%#6F2A26

Darker −30%#491C19

Darker −40%#230D0C

More saturated +25%#DA2B21

Less saturated −25%#9C635F

Channel breakdown

R187

G71

B64

Red187 (73.3%)

Green71 (27.8%)

Blue64 (25.1%)

Hue3.41°

Saturation (HSL)49%

Lightness49.22%

Dominant channelRed

Hex per channelR BB · G 47 · B 40

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Harmonies

Lighter and darker

Similar named colours

Also reads as

BB4740 (chemical formula)

Formula
51,250.21 g/mol
4741 atoms

BB4740 has a molar mass of 51,250.21 g/mol, made up of 4741 atoms across 1 element: 4741 × B.

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Molar mass

Molar mass51,250.21 g/mol

Total atoms per molecule4741

Distinct elements1

Mass of one molecule8.5102976 × 10^-20 g

Molecules per gram1.175047 × 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 × 4741)51,250.21 g/mol, 100%

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Elements in this formula

Boron

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