Recognised as Colour

#B50733

#B50733
Red
Dark
Nearest: Firebrick

#B50733 is a red with RGB values 181, 7, 51 and HSL 345°, 93%, 37%. It is a dark colour, so white text on it reaches 6.9:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#B50733#B50733

HEX#B50733

RGBrgb(181, 7, 51)

RGB (0–1)0.7098, 0.0275, 0.2

RGB percentages71%, 2.7%, 20%

HSLhsl(344.8, 92.6%, 36.9%)

HSV / HSBhsv(344.8, 96.1%, 71%)

CMYK0%, 96.1%, 71.8%, 29%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,863,859

CSS custom property--colour: #B50733;

Brightness & contrast

Relative luminance0.10215WCAG 2.x, 0 is black and 1 is white

Perceived brightness100.6 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.9:1

Contrast with white6.9:1WCAG normal text: AA

Contrast with black3.04:1WCAG normal text: Fail

Greyscale equivalent#2F2F2F

Inverted#4AF8CC

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#494433no red cones; affects about 1% of men; ΔE 65.9 from the original

Deuteranopia#71662Dno green cones; the most common form, about 1% of men; ΔE 66.3 from the original

Tritanopia#C7001Fno blue cones; rare, and affects men and women equally; ΔE 17.5 from the original

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

Contrast with white, large text6.9:1WCAG large text: AAA

Contrast with black, large text3.04:1WCAG large text: AA

Named colours

Firebrick · ΔE 12.7 Brown · ΔE 13.2 Crimson · ΔE 14.1 Dark red · ΔE 21.1 Maroon · ΔE 22.2 Indian red · ΔE 23.6

Nearest named CSS colourFirebrick (#B22222)ΔE 12.74, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#07B589

Analogous#B5078A, #B53207

Triadic#33B507, #0733B5

Split complementary#07B532, #078AB5

Tetradic#8AB507, #07B589, #3207B5

Tints, shades & saturation

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

Lighter +40%#FB8DA9

Lighter +30%#F95C84

Lighter +20%#F72B5F

Lighter +10%#E60941

Darker −10%#840525

Darker −20%#530317

Darker −30%#220109

Darker −40%#000000

More saturated +25%#BC0030

Less saturated −25%#9E1F3F

Channel breakdown

R181

B51

Red181 (71%)

Green7 (2.7%)

Blue51 (20%)

Hue344.83°

Saturation (HSL)92.55%

Lightness36.86%

Dominant channelRed

Hex per channelR B5 · G 07 · B 33

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B50733 (chemical formula)

Formula
548,423.73 g/mol
50733 atoms

B50733 has a molar mass of 548,423.73 g/mol, made up of 50733 atoms across 1 element: 50733 × B.

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Molar mass

Molar mass548,423.73 g/mol

Total atoms per molecule50733

Distinct elements1

Mass of one molecule9.1067903 × 10^-19 g

Molecules per gram1.0980817 × 10^18

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 × 50733)548,423.73 g/mol, 100%

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Elements in this formula

Boron

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