Recognised as Colour
#AC581F
- #AC581F
- Orange
- Dark
- Nearest: Sienna
#AC581F is a orange with RGB values 172, 88, 31 and HSL 24°, 69%, 40%. It is a dark colour, so white text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Sienna.
Colour values
#AC581F#AC581F
HEX#AC581F
RGBrgb(172, 88, 31)
RGB (0–1)0.6745, 0.3451, 0.1216
RGB percentages67.5%, 34.5%, 12.2%
HSLhsl(24.3, 69.5%, 39.8%)
HSV / HSBhsv(24.3, 82%, 67.5%)
CMYK0%, 48.8%, 82%, 32.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer11,294,751
CSS custom property--colour: #AC581F;
Brightness & contrast
Relative luminance0.15849WCAG 2.x, 0 is black and 1 is white
Perceived brightness116.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.04:1
Contrast with white5.04:1WCAG normal text: AA
Contrast with black4.17:1WCAG normal text: Fail
Greyscale equivalent#666666
Inverted#53A7E0
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text5.04:1WCAG large text: AAA
Contrast with black, large text4.17:1WCAG large text: AA
Named colours
Hue familyorange
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#1F73AC
Analogous#AC1F2D, #AC9F1F
Triadic#1FAC58, #581FAC
Split complementary#1FAC9F, #1F2CAC
Tetradic#2DAC1F, #1F73AC, #9F1FAC
Tints, shades & saturation
Channel breakdown
R172
G88
B31
Red172 (67.5%)
Green88 (34.5%)
Blue31 (12.2%)
Hue24.26°
Saturation (HSL)69.46%
Lightness39.8%
Dominant channelRed
Hex per channelR AC · G 58 · B 1F
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Also reads as
Ac581F (chemical formula)
- Formula
- 131,905.998 g/mol
- 582 atoms
Ac581F has a molar mass of 131,905.998 g/mol, made up of 582 atoms across 2 elements: 581 × Ac, 1 × F.
Molar mass
Molar mass131,905.998 g/mol
Total atoms per molecule582
Distinct elements2
Mass of one molecule2.1903506 × 10^-19 g
Molecules per gram4.5654791 × 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 × 581)131,887 g/mol, 99.986%
Fluorine (F)18.998 g/mol, 0.014%
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