Recognised as Colour

#B1272B

#B1272B
Red
Dark
Nearest: Firebrick

#B1272B is a red with RGB values 177, 39, 43 and HSL 358°, 64%, 42%. It is a dark colour, so white text on it reaches 6.6:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#B1272B#B1272B

HEX#B1272B

RGBrgb(177, 39, 43)

RGB (0–1)0.6941, 0.1529, 0.1686

RGB percentages69.4%, 15.3%, 16.9%

HSLhsl(358.3, 63.9%, 42.4%)

HSV / HSBhsv(358.3, 78%, 69.4%)

CMYK0%, 78%, 75.7%, 30.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,609,899

CSS custom property--colour: #B1272B;

Brightness & contrast

Relative luminance0.10973WCAG 2.x, 0 is black and 1 is white

Perceived brightness102.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.57:1

Contrast with white6.57:1WCAG normal text: AA

Contrast with black3.19:1WCAG normal text: Fail

Greyscale equivalent#454545

Inverted#4ED8D4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#524A2Ano red cones; affects about 1% of men; ΔE 58.2 from the original

Deuteranopia#746826no green cones; the most common form, about 1% of men; ΔE 58.6 from the original

Tritanopia#C3002Ano blue cones; rare, and affects men and women equally; ΔE 12.2 from the original

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

Contrast with white, large text6.57:1WCAG large text: AAA

Contrast with black, large text3.19:1WCAG large text: AA

Named colours

Firebrick · ΔE 5 Brown · ΔE 5.7 Dark red · ΔE 14.6 Maroon · ΔE 16.3 Crimson · ΔE 18.1 Indian red · ΔE 20

Nearest named CSS colourFirebrick (#B22222)ΔE 5.03, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#27B1AD

Analogous#B12770, #B16827

Triadic#2BB127, #272BB1

Split complementary#27B168, #2770B1

Tetradic#70B127, #27B1AD, #6827B1

Tints, shades & saturation

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

Lighter +40%#EFB5B7

Lighter +30%#E68B8E

Lighter +20%#DC6265

Lighter +10%#D3383C

Darker −10%#871E21

Darker −20%#5D1517

Darker −30%#340B0D

Darker −40%#0A0202

More saturated +25%#CC0C12

Less saturated −25%#964244

Channel breakdown

R177

G39

B43

Red177 (69.4%)

Green39 (15.3%)

Blue43 (16.9%)

Hue358.26°

Saturation (HSL)63.89%

Lightness42.35%

Dominant channelRed

Hex per channelR B1 · G 27 · B 2B

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B1272B (chemical formula)

Formula
13,761.13 g/mol
1273 atoms

B1272B has a molar mass of 13,761.13 g/mol, made up of 1273 atoms across 1 element: 1273 × B.

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Molar mass

Molar mass13,761.13 g/mol

Total atoms per molecule1273

Distinct elements1

Mass of one molecule2.2850894 × 10^-20 g

Molecules per gram4.3761964 × 10^19

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 × 1273)13,761.13 g/mol, 100%

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Elements in this formula

Boron

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