Recognised as Colour

#B20303

#B20303
Red
Dark
Nearest: Firebrick

#B20303 is a red with RGB values 178, 3, 3 and HSL 0°, 97%, 35%. 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

#B20303#B20303

HEX#B20303

RGBrgb(178, 3, 3)

RGB (0–1)0.698, 0.0118, 0.0118

RGB percentages69.8%, 1.2%, 1.2%

HSLhsl(0, 96.7%, 35.5%)

HSV / HSBhsv(0, 98.3%, 69.8%)

CMYK0%, 98.3%, 98.3%, 30.2%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,666,179

CSS custom property--colour: #B20303;

Brightness & contrast

Relative luminance0.09537WCAG 2.x, 0 is black and 1 is white

Perceived brightness97.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 7.22:1

Contrast with white7.22:1WCAG normal text: AAA

Contrast with black2.91:1WCAG normal text: Fail

Greyscale equivalent#282828

Inverted#4DFCFC

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4A4000no red cones; affects about 1% of men; ΔE 65.9 from the original

Deuteranopia#716300no green cones; the most common form, about 1% of men; ΔE 64.9 from the original

Tritanopia#C5000Ano blue cones; rare, and affects men and women equally; ΔE 6.8 from the original

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

Contrast with white, large text7.22:1WCAG large text: AAA

Contrast with black, large text2.91:1WCAG large text: Fail

Named colours

Firebrick · ΔE 13.6 Dark red · ΔE 15.9 Maroon · ΔE 21 Crimson · ΔE 21.8 Brown · ΔE 22.5 Tomato · ΔE 25.6

Nearest named CSS colourFirebrick (#B22222)ΔE 13.55, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#03B2B2

Analogous#B2035A, #B25A03

Triadic#03B203, #0303B2

Split complementary#03B25A, #035AB2

Tetradic#5AB203, #03B2B2, #5A03B2

Tints, shades & saturation

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

Lighter +40%#FD8484

Lighter +30%#FC5252

Lighter +20%#FB2020

Lighter +10%#E40404

Darker −10%#800202

Darker −20%#4E0101

Darker −30%#1C0000

Darker −40%#000000

More saturated +25%#B50000

Less saturated −25%#9B1A1A

Channel breakdown

R178

Red178 (69.8%)

Green3 (1.2%)

Blue3 (1.2%)

Hue0°

Saturation (HSL)96.69%

Lightness35.49%

Dominant channelRed

Hex per channelR B2 · G 03 · B 03

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B20303 (chemical formula)

Formula
219,475.43 g/mol
20303 atoms

B20303 has a molar mass of 219,475.43 g/mol, made up of 20303 atoms across 1 element: 20303 × B.

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Molar mass

Molar mass219,475.43 g/mol

Total atoms per molecule20303

Distinct elements1

Mass of one molecule3.6444753 × 10^-19 g

Molecules per gram2.7438792 × 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 × 20303)219,475.43 g/mol, 100%

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Elements in this formula

Boron

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