Recognised as Colour

#B52613

#B52613
Red
Dark
Nearest: Firebrick

#B52613 is a red with RGB values 181, 38, 19 and HSL 7°, 81%, 39%. It is a dark colour, so white text on it reaches 6.5:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#B52613#B52613

HEX#B52613

RGBrgb(181, 38, 19)

RGB (0–1)0.7098, 0.149, 0.0745

RGB percentages71%, 14.9%, 7.5%

HSLhsl(7, 81%, 39.2%)

HSV / HSBhsv(7, 89.5%, 71%)

CMYK0%, 79%, 89.5%, 29%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,871,763

CSS custom property--colour: #B52613;

Brightness & contrast

Relative luminance0.11257WCAG 2.x, 0 is black and 1 is white

Perceived brightness103.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.46:1

Contrast with white6.46:1WCAG normal text: AA

Contrast with black3.25:1WCAG normal text: Fail

Greyscale equivalent#434343

Inverted#4AD9EC

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#544A0Dno red cones; affects about 1% of men; ΔE 60.1 from the original

Deuteranopia#776A06no green cones; the most common form, about 1% of men; ΔE 60.4 from the original

Tritanopia#C80024no blue cones; rare, and affects men and women equally; ΔE 13.2 from the original

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

Contrast with white, large text6.46:1WCAG large text: AAA

Contrast with black, large text3.25:1WCAG large text: AA

Named colours

Firebrick · ΔE 8.6 Dark red · ΔE 13.6 Brown · ΔE 16.8 Maroon · ΔE 18.1 Crimson · ΔE 21.2 Tomato · ΔE 22.3

Nearest named CSS colourFirebrick (#B22222)ΔE 8.59, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#13A2B5

Analogous#B51351, #B57713

Triadic#13B526, #2613B5

Split complementary#13B577, #1351B5

Tetradic#51B513, #13A2B5, #7713B5

Tints, shades & saturation

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

Lighter +40%#F5A99F

Lighter +30%#F08071

Lighter +20%#EB5743

Lighter +10%#E33018

Darker −10%#871C0E

Darker −20%#591309

Darker −30%#2B0904

Darker −40%#000000

More saturated +25%#C81700

Less saturated −25%#9C392C

Channel breakdown

R181

G38

B19

Red181 (71%)

Green38 (14.9%)

Blue19 (7.5%)

Hue7.04°

Saturation (HSL)81%

Lightness39.22%

Dominant channelRed

Hex per channelR B5 · G 26 · B 13

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B52613 (chemical formula)

Formula
568,746.53 g/mol
52613 atoms

B52613 has a molar mass of 568,746.53 g/mol, made up of 52613 atoms across 1 element: 52613 × B.

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Molar mass

Molar mass568,746.53 g/mol

Total atoms per molecule52613

Distinct elements1

Mass of one molecule9.4442583 × 10^-19 g

Molecules per gram1.0588444 × 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 × 52613)568,746.53 g/mol, 100%

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Elements in this formula

Boron

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