Recognised as Colour

#B11F15

#B11F15
Red
Dark
Nearest: Firebrick

#B11F15 is a red with RGB values 177, 31, 21 and HSL 4°, 79%, 39%. It is a dark colour, so white text on it reaches 6.8:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#B11F15#B11F15

HEX#B11F15

RGBrgb(177, 31, 21)

RGB (0–1)0.6941, 0.1216, 0.0824

RGB percentages69.4%, 12.2%, 8.2%

HSLhsl(3.8, 78.8%, 38.8%)

HSV / HSBhsv(3.8, 88.1%, 69.4%)

CMYK0%, 82.5%, 88.1%, 30.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,607,829

CSS custom property--colour: #B11F15;

Brightness & contrast

Relative luminance0.10381WCAG 2.x, 0 is black and 1 is white

Perceived brightness99.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.83:1

Contrast with white6.83:1WCAG normal text: AA

Contrast with black3.08:1WCAG normal text: Fail

Greyscale equivalent#3D3D3D

Inverted#4EE0EA

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#504611no red cones; affects about 1% of men; ΔE 60.5 from the original

Deuteranopia#736609no green cones; the most common form, about 1% of men; ΔE 60.8 from the original

Tritanopia#C4001Fno blue cones; rare, and affects men and women equally; ΔE 10.4 from the original

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

Contrast with white, large text6.83:1WCAG large text: AAA

Contrast with black, large text3.08:1WCAG large text: AA

Named colours

Firebrick · ΔE 6.1 Dark red · ΔE 11.9 Brown · ΔE 14.7 Maroon · ΔE 16.3 Crimson · ΔE 19.9 Tomato · ΔE 23.9

Nearest named CSS colourFirebrick (#B22222)ΔE 6.15, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#15A7B1

Analogous#B11559, #B16D15

Triadic#15B11F, #1F15B1

Split complementary#15B16D, #1559B1

Tetradic#59B115, #15A7B1, #6D15B1

Tints, shades & saturation

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

Lighter +40%#F4A49E

Lighter +30%#EE7971

Lighter +20%#E94E43

Lighter +10%#DF271A

Darker −10%#831710

Darker −20%#560F0A

Darker −30%#280705

Darker −40%#000000

More saturated +25%#C60D00

Less saturated −25%#98352E

Channel breakdown

R177

G31

B21

Red177 (69.4%)

Green31 (12.2%)

Blue21 (8.2%)

Hue3.85°

Saturation (HSL)78.79%

Lightness38.82%

Dominant channelRed

Hex per channelR B1 · G 1F · B 15

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B11F15 (chemical formula)

Formula
403.88 g/mol
26 atoms

B11F15 has a molar mass of 403.88 g/mol, made up of 26 atoms across 2 elements: 11 × B, 15 × F.

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Molar mass

Molar mass403.88 g/mol

Total atoms per molecule26

Distinct elements2

Mass of one molecule6.7065852 × 10^-22 g

Molecules per gram1.4910718 × 10^21

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

B29.4%

F70.6%

Boron (B × 11)118.91 g/mol, 29.442%

Fluorine (F × 15)284.97 g/mol, 70.558%

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