Recognised as Colour

#B51B64

#B51B64
Red
Dark
Nearest: Medium violet red

#B51B64 is a red with RGB values 181, 27, 100 and HSL 332°, 74%, 41%. It is a dark colour, so white text on it reaches 6.4:1 contrast (AA for normal text). The nearest named colour is Medium violet red.

Colour values

#B51B64#B51B64

HEX#B51B64

RGBrgb(181, 27, 100)

RGB (0–1)0.7098, 0.1059, 0.3922

RGB percentages71%, 10.6%, 39.2%

HSLhsl(331.6, 74%, 40.8%)

HSV / HSBhsv(331.6, 85.1%, 71%)

CMYK0%, 85.1%, 44.8%, 29%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,869,028

CSS custom property--colour: #B51B64;

Brightness & contrast

Relative luminance0.11528WCAG 2.x, 0 is black and 1 is white

Perceived brightness106.6 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.35:1

Contrast with white6.35:1WCAG normal text: AA

Contrast with black3.31:1WCAG normal text: Fail

Greyscale equivalent#414141

Inverted#4AE49B

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#434D66no red cones; affects about 1% of men; ΔE 61.9 from the original

Deuteranopia#6C6A61no green cones; the most common form, about 1% of men; ΔE 63.9 from the original

Tritanopia#C5003Eno blue cones; rare, and affects men and women equally; ΔE 26.6 from the original

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

Contrast with white, large text6.35:1WCAG large text: AAA

Contrast with black, large text3.31:1WCAG large text: AA

Named colours

Medium violet red · ΔE 16.7 Pale violetred · ΔE 26.4 Hot pink · ΔE 26.7 Deep pink · ΔE 27.3 Indian red · ΔE 32.2 Brown · ΔE 34.6

Nearest named CSS colourMedium violet red (#C71585)ΔE 16.7, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#1BB56C

Analogous#B51BB1, #B51F1B

Triadic#64B51B, #1B64B5

Split complementary#1BB51F, #1BB1B5

Tetradic#B1B51B, #1BB56C, #1F1BB5

Tints, shades & saturation

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

Lighter +40%#F2AACC

Lighter +30%#EC7DB2

Lighter +20%#E55197

Lighter +10%#DE257D

Darker −10%#89144B

Darker −20%#5C0E33

Darker −30%#30071A

Darker −40%#030102

More saturated +25%#CF0163

Less saturated −25%#9B3565

Channel breakdown

R181

G27

B100

Red181 (71%)

Green27 (10.6%)

Blue100 (39.2%)

Hue331.56°

Saturation (HSL)74.04%

Lightness40.78%

Dominant channelRed

Hex per channelR B5 · G 1B · B 64

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B51B64 (chemical formula)

Formula
1,243.15 g/mol
115 atoms

B51B64 has a molar mass of 1,243.15 g/mol, made up of 115 atoms across 1 element: 115 × B.

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Molar mass

Molar mass1,243.15 g/mol

Total atoms per molecule115

Distinct elements1

Mass of one molecule2.0642991 × 10^-21 g

Molecules per gram4.8442591 × 10^20

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 × 115)1,243.15 g/mol, 100%

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Elements in this formula

Boron

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