Recognised as Colour

#B1091F

#B1091F
Red
Dark
Nearest: Firebrick

#B1091F is a red with RGB values 177, 9, 31 and HSL 352°, 90%, 36%. It is a dark colour, so white text on it reaches 7.2:1 contrast (AAA for normal text). The nearest named colour is Firebrick.

Colour values

#B1091F#B1091F

HEX#B1091F

RGBrgb(177, 9, 31)

RGB (0–1)0.6941, 0.0353, 0.1216

RGB percentages69.4%, 3.5%, 12.2%

HSLhsl(352.1, 90.3%, 36.5%)

HSV / HSBhsv(352.1, 94.9%, 69.4%)

CMYK0%, 94.9%, 82.5%, 30.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,602,207

CSS custom property--colour: #B1091F;

Brightness & contrast

Relative luminance0.09641WCAG 2.x, 0 is black and 1 is white

Perceived brightness97.6 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 7.17:1

Contrast with white7.17:1WCAG normal text: AAA

Contrast with black2.93:1WCAG normal text: Fail

Greyscale equivalent#2E2E2E

Inverted#4EF6E0

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#49421Dno red cones; affects about 1% of men; ΔE 65.3 from the original

Deuteranopia#706316no green cones; the most common form, about 1% of men; ΔE 64.5 from the original

Tritanopia#C40016no blue cones; rare, and affects men and women equally; ΔE 11.6 from the original

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

Contrast with white, large text7.17:1WCAG large text: AAA

Contrast with black, large text2.93:1WCAG large text: Fail

Named colours

Firebrick · ΔE 4.8 Brown · ΔE 12.7 Dark red · ΔE 13.6 Crimson · ΔE 14.9 Maroon · ΔE 17 Tomato · ΔE 26.7

Nearest named CSS colourFirebrick (#B22222)ΔE 4.85, a close match

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#09B19B

Analogous#B10973, #B14709

Triadic#1FB109, #091FB1

Split complementary#09B147, #0973B1

Tetradic#73B109, #09B19B, #4709B1

Tints, shades & saturation

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

Lighter +40%#F98D9B

Lighter +30%#F75C71

Lighter +20%#F42C46

Lighter +10%#E20B28

Darker −10%#800717

Darker −20%#50040E

Darker −30%#1F0206

Darker −40%#000000

More saturated +25%#BA0018

Less saturated −25%#9A2030

Channel breakdown

R177

B31

Red177 (69.4%)

Green9 (3.5%)

Blue31 (12.2%)

Hue352.14°

Saturation (HSL)90.32%

Lightness36.47%

Dominant channelRed

Hex per channelR B1 · G 09 · B 1F

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B1091F (chemical formula)

Formula
11,812.708 g/mol
1092 atoms

B1091F has a molar mass of 11,812.708 g/mol, made up of 1092 atoms across 2 elements: 1091 × B, 1 × F.

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Molar mass

Molar mass11,812.708 g/mol

Total atoms per molecule1092

Distinct elements2

Mass of one molecule1.9615463 × 10^-20 g

Molecules per gram5.0980188 × 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

B99.8%

F0.2%

Boron (B × 1091)11,793.71 g/mol, 99.839%

Fluorine (F)18.998 g/mol, 0.161%

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Elements in this formula

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