Recognised as Colour

#C91B47

#C91B47
Red
Dark
Nearest: Crimson

#C91B47 is a red with RGB values 201, 27, 71 and HSL 345°, 76%, 45%. It is a dark colour, so white text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#C91B47#C91B47

HEX#C91B47

RGBrgb(201, 27, 71)

RGB (0–1)0.7882, 0.1059, 0.2784

RGB percentages78.8%, 10.6%, 27.8%

HSLhsl(344.8, 76.3%, 44.7%)

HSV / HSBhsv(344.8, 86.6%, 78.8%)

CMYK0%, 86.6%, 64.7%, 21.2%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer13,179,719

CSS custom property--colour: #C91B47;

Brightness & contrast

Relative luminance0.13656WCAG 2.x, 0 is black and 1 is white

Perceived brightness114.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 5.63:1

Contrast with white5.63:1WCAG normal text: AA

Contrast with black3.73:1WCAG normal text: Fail

Greyscale equivalent#434343

Inverted#36E4B8

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#545147no red cones; affects about 1% of men; ΔE 68.7 from the original

Deuteranopia#7E7442no green cones; the most common form, about 1% of men; ΔE 69.6 from the original

Tritanopia#DD0030no blue cones; rare, and affects men and women equally; ΔE 19.6 from the original

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

Contrast with white, large text5.63:1WCAG large text: AAA

Contrast with black, large text3.73:1WCAG large text: AA

Named colours

Crimson · ΔE 13.3 Firebrick · ΔE 19 Brown · ΔE 19 Indian red · ΔE 22.8 Dark red · ΔE 28.8 Maroon · ΔE 29.9

Nearest named CSS colourCrimson (#DC143C)ΔE 13.28, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#1BC99D

Analogous#C91B9E, #C9461B

Triadic#47C91B, #1B47C9

Split complementary#1BC946, #1B9EC9

Tetradic#9EC91B, #1BC99D, #461BC9

Tints, shades & saturation

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

Lighter +40%#F6BAC9

Lighter +30%#F08DA6

Lighter +20%#EA6083

Lighter +10%#E43360

Darker −10%#9C1537

Darker −20%#6F0F27

Darker −30%#420917

Darker −40%#150307

More saturated +25%#E4003A

Less saturated −25%#AC3755

Channel breakdown

R201

G27

B71

Red201 (78.8%)

Green27 (10.6%)

Blue71 (27.8%)

Hue344.83°

Saturation (HSL)76.32%

Lightness44.71%

Dominant channelRed

Hex per channelR C9 · G 1B · B 47

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Harmonies

Lighter and darker

Similar named colours

Also reads as

C91B47 (chemical formula)

Formula
1,601.071 g/mol
138 atoms

C91B47 has a molar mass of 1,601.071 g/mol, made up of 138 atoms across 2 elements: 91 × C, 47 × B.

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Molar mass

Molar mass1,601.071 g/mol

Total atoms per molecule138

Distinct elements2

Mass of one molecule2.6586409 × 10^-21 g

Molecules per gram3.7613202 × 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

C68.3%

B31.7%

Carbon (C × 91)1,093.001 g/mol, 68.267%

Boron (B × 47)508.07 g/mol, 31.733%

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