Recognised as Colour

#B90309

#B90309
Red
Dark
Nearest: Firebrick

#B90309 is a red with RGB values 185, 3, 9 and HSL 358°, 97%, 37%. 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

#B90309#B90309

HEX#B90309

RGBrgb(185, 3, 9)

RGB (0–1)0.7255, 0.0118, 0.0353

RGB percentages72.5%, 1.2%, 3.5%

HSLhsl(358, 96.8%, 36.9%)

HSV / HSBhsv(358, 98.4%, 72.5%)

CMYK0%, 98.4%, 95.1%, 27.5%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,124,937

CSS custom property--colour: #B90309;

Brightness & contrast

Relative luminance0.10399WCAG 2.x, 0 is black and 1 is white

Perceived brightness101.2 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.82:1

Contrast with white6.82:1WCAG normal text: AA

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

Greyscale equivalent#2A2A2A

Inverted#46FCF6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4D4303no red cones; affects about 1% of men; ΔE 67.7 from the original

Deuteranopia#756700no green cones; the most common form, about 1% of men; ΔE 67.1 from the original

Tritanopia#CD000Cno blue cones; rare, and affects men and women equally; ΔE 7.7 from the original

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

Contrast with white, large text6.82:1WCAG large text: AAA

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

Named colours

Firebrick · ΔE 13.6 Dark red · ΔE 17.7 Crimson · ΔE 19.8 Maroon · ΔE 22.7 Brown · ΔE 23 Tomato · ΔE 24.3

Nearest named CSS colourFirebrick (#B22222)ΔE 13.62, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#03B9B3

Analogous#B90364, #B95803

Triadic#09B903, #0309B9

Split complementary#03B958, #0364B9

Tetradic#64B903, #03B9B3, #5803B9

Tints, shades & saturation

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

Lighter +40%#FD8B8F

Lighter +30%#FC595E

Lighter +20%#FB272E

Lighter +10%#EB040B

Darker −10%#870207

Darker −20%#550104

Darker −30%#220102

Darker −40%#000000

More saturated +25%#BC0006

Less saturated −25%#A21A1F

Channel breakdown

R185

Red185 (72.5%)

Green3 (1.2%)

Blue9 (3.5%)

Hue358.02°

Saturation (HSL)96.81%

Lightness36.86%

Dominant channelRed

Hex per channelR B9 · G 03 · B 09

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B90309 (chemical formula)

Formula
976,240.29 g/mol
90309 atoms

B90309 has a molar mass of 976,240.29 g/mol, made up of 90309 atoms across 1 element: 90309 × B.

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Molar mass

Molar mass976,240.29 g/mol

Total atoms per molecule90309

Distinct elements1

Mass of one molecule1.6210851 × 10^-18 g

Molecules per gram6.1687075 × 10^17

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 × 90309)976,240.29 g/mol, 100%

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Elements in this formula

Boron

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