Recognised as Colour

#B50707

#B50707
Red
Dark
Nearest: Firebrick

#B50707 is a red with RGB values 181, 7, 7 and HSL 0°, 93%, 37%. It is a dark colour, so white text on it reaches 7:1 contrast (AAA for normal text). The nearest named colour is Firebrick.

Colour values

#B50707#B50707

HEX#B50707

RGBrgb(181, 7, 7)

RGB (0–1)0.7098, 0.0275, 0.0275

RGB percentages71%, 2.7%, 2.7%

HSLhsl(0, 92.6%, 36.9%)

HSV / HSBhsv(0, 96.1%, 71%)

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

24-bit integer11,863,815

CSS custom property--colour: #B50707;

Brightness & contrast

Relative luminance0.09991WCAG 2.x, 0 is black and 1 is white

Perceived brightness99.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 7:1

Contrast with white7:1WCAG normal text: AAA

Contrast with black3:1WCAG normal text: Fail

Greyscale equivalent#2C2C2C

Inverted#4AF8F8

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4C4201no red cones; affects about 1% of men; ΔE 66.1 from the original

Deuteranopia#736500no green cones; the most common form, about 1% of men; ΔE 65.5 from the original

Tritanopia#C8000Eno blue cones; rare, and affects men and women equally; ΔE 7.1 from the original

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

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

Contrast with black, large text3:1WCAG large text: Fail

Named colours

Firebrick · ΔE 12.9 Dark red · ΔE 16.2 Crimson · ΔE 20.6 Maroon · ΔE 21.2 Brown · ΔE 22 Tomato · ΔE 24.8

Nearest named CSS colourFirebrick (#B22222)ΔE 12.87, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#07B5B5

Analogous#B5075E, #B55E07

Triadic#07B507, #0707B5

Split complementary#07B55E, #075EB5

Tetradic#5EB507, #07B5B5, #5E07B5

Tints, shades & saturation

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

Lighter +40%#FB8D8D

Lighter +30%#F95C5C

Lighter +20%#F72B2B

Lighter +10%#E60909

Darker −10%#840505

Darker −20%#530303

Darker −30%#220101

Darker −40%#000000

More saturated +25%#BC0000

Less saturated −25%#9E1F1F

Channel breakdown

R181

Red181 (71%)

Green7 (2.7%)

Blue7 (2.7%)

Hue0°

Saturation (HSL)92.55%

Lightness36.86%

Dominant channelRed

Hex per channelR B5 · G 07 · B 07

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B50707 (chemical formula)

Formula
548,142.67 g/mol
50707 atoms

B50707 has a molar mass of 548,142.67 g/mol, made up of 50707 atoms across 1 element: 50707 × B.

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Molar mass

Molar mass548,142.67 g/mol

Total atoms per molecule50707

Distinct elements1

Mass of one molecule9.1021232 × 10^-19 g

Molecules per gram1.0986448 × 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 × 50707)548,142.67 g/mol, 100%

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Elements in this formula

Boron

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