Recognised as Colour

#AC361F

#AC361F
Red
Dark
Nearest: Firebrick

#AC361F is a red with RGB values 172, 54, 31 and HSL 10°, 69%, 40%. It is a dark colour, so white text on it reaches 6.4:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#AC361F#AC361F

HEX#AC361F

RGBrgb(172, 54, 31)

RGB (0–1)0.6745, 0.2118, 0.1216

RGB percentages67.5%, 21.2%, 12.2%

HSLhsl(9.8, 69.5%, 39.8%)

HSV / HSBhsv(9.8, 82%, 67.5%)

CMYK0%, 68.6%, 82%, 32.5%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,286,047

CSS custom property--colour: #AC361F;

Brightness & contrast

Relative luminance0.11508WCAG 2.x, 0 is black and 1 is white

Perceived brightness103.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.36:1

Contrast with white6.36:1WCAG normal text: AA

Contrast with black3.3:1WCAG normal text: Fail

Greyscale equivalent#4D4D4D

Inverted#53C9E0

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#594F1Bno red cones; affects about 1% of men; ΔE 51.1 from the original

Deuteranopia#766919no green cones; the most common form, about 1% of men; ΔE 51.4 from the original

Tritanopia#BE0D32no blue cones; rare, and affects men and women equally; ΔE 19.6 from the original

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

Contrast with white, large text6.36:1WCAG large text: AAA

Contrast with black, large text3.3:1WCAG large text: AA

Named colours

Firebrick · ΔE 9.4 Brown · ΔE 10.4 Dark red · ΔE 13 Maroon · ΔE 15.1 Sienna · ΔE 18.5 Saddle brown · ΔE 20.8

Nearest named CSS colourFirebrick (#B22222)ΔE 9.38, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#1F95AC

Analogous#AC1F4F, #AC7D1F

Triadic#1FAC36, #361FAC

Split complementary#1FAC7D, #1F4EAC

Tetradic#4EAC1F, #1F95AC, #7C1FAC

Tints, shades & saturation

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

Lighter +40%#EFB3A8

Lighter +30%#E78E7D

Lighter +20%#E06951

Lighter +10%#D74427

Darker −10%#812817

Darker −20%#561B0F

Darker −30%#2A0D08

Darker −40%#000000

More saturated +25%#C52506

Less saturated −25%#934738

Channel breakdown

R172

G54

B31

Red172 (67.5%)

Green54 (21.2%)

Blue31 (12.2%)

Hue9.79°

Saturation (HSL)69.46%

Lightness39.8%

Dominant channelRed

Hex per channelR AC · G 36 · B 1F

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Harmonies

Lighter and darker

Similar named colours

Also reads as

Ac361F (chemical formula)

Formula
81,965.998 g/mol
362 atoms

Ac361F has a molar mass of 81,965.998 g/mol, made up of 362 atoms across 2 elements: 361 × Ac, 1 × F.

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Molar mass

Molar mass81,965.998 g/mol

Total atoms per molecule362

Distinct elements2

Mass of one molecule1.3610774 × 10^-19 g

Molecules per gram7.3471206 × 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

Ac100%

F0%

Actinium (Ac × 361)81,947 g/mol, 99.977%

Fluorine (F)18.998 g/mol, 0.023%

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