Recognised as Colour

#AC2831

#AC2831
Red
Dark
Nearest: Brown

#AC2831 is a red with RGB values 172, 40, 49 and HSL 356°, 62%, 42%. It is a dark colour, so white text on it reaches 6.8:1 contrast (AA for normal text). The nearest named colour is Brown.

Colour values

#AC2831#AC2831

HEX#AC2831

RGBrgb(172, 40, 49)

RGB (0–1)0.6745, 0.1569, 0.1922

RGB percentages67.5%, 15.7%, 19.2%

HSLhsl(355.9, 62.3%, 41.6%)

HSV / HSBhsv(355.9, 76.7%, 67.5%)

CMYK0%, 76.7%, 71.5%, 32.5%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,282,481

CSS custom property--colour: #AC2831;

Brightness & contrast

Relative luminance0.1051WCAG 2.x, 0 is black and 1 is white

Perceived brightness100.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.77:1

Contrast with white6.77:1WCAG normal text: AA

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

Greyscale equivalent#454545

Inverted#53D7CE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4F4930no red cones; affects about 1% of men; ΔE 56.6 from the original

Deuteranopia#70652Dno green cones; the most common form, about 1% of men; ΔE 56.6 from the original

Tritanopia#BD002Dno blue cones; rare, and affects men and women equally; ΔE 12.7 from the original

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

Contrast with white, large text6.77:1WCAG large text: AAA

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

Named colours

Brown · ΔE 4.2 Firebrick · ΔE 10 Dark red · ΔE 17.1 Maroon · ΔE 17.3 Indian red · ΔE 17.7 Crimson · ΔE 20.6

Nearest named CSS colourBrown (#A52A2A)ΔE 4.22, a close match

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#28ACA3

Analogous#AC2873, #AC6128

Triadic#31AC28, #2831AC

Split complementary#28AC61, #2873AC

Tetradic#73AC28, #28ACA3, #6128AC

Tints, shades & saturation

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

Lighter +40%#EDB3B7

Lighter +30%#E48990

Lighter +20%#DA6068

Lighter +10%#D03741

Darker −10%#831E25

Darker −20%#591519

Darker −30%#300B0E

Darker −40%#060202

More saturated +25%#C70D1A

Less saturated −25%#924348

Channel breakdown

R172

G40

B49

Red172 (67.5%)

Green40 (15.7%)

Blue49 (19.2%)

Hue355.91°

Saturation (HSL)62.26%

Lightness41.57%

Dominant channelRed

Hex per channelR AC · G 28 · B 31

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Harmonies

Lighter and darker

Similar named colours

Also reads as

Ac2831 (chemical formula)

Formula
642,637 g/mol
2831 atoms

Ac2831 has a molar mass of 642,637 g/mol, made up of 2831 atoms across 1 element: 2831 × Ac.

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Molar mass

Molar mass642,637 g/mol

Total atoms per molecule2831

Distinct elements1

Mass of one molecule1.0671238 × 10^-18 g

Molecules per gram9.3709836 × 10^17

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

Ac100%

Actinium (Ac × 2831)642,637 g/mol, 100%

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Elements in this formula

Actinium

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