Recognised as Colour

#FF491F

#FF491F
Red
Dark
Nearest: Orange red

#FF491F is a red with RGB values 255, 73, 31 and HSL 11°, 100%, 56%. It is a dark colour, so black text on it reaches 6.2:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#FF491F#FF491F

HEX#FF491F

RGBrgb(255, 73, 31)

RGB (0–1)1, 0.2863, 0.1216

RGB percentages100%, 28.6%, 12.2%

HSLhsl(11.2, 100%, 56.1%)

HSV / HSBhsv(11.2, 87.8%, 100%)

CMYK0%, 71.4%, 87.8%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,730,399

CSS custom property--colour: #FF491F;

Brightness & contrast

Relative luminance0.26124WCAG 2.x, 0 is black and 1 is white

Perceived brightness150.6 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.22:1

Contrast with white3.37:1WCAG normal text: Fail

Contrast with black6.22:1WCAG normal text: AA

Greyscale equivalent#6D6D6D

Inverted#00B6E0

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#817215no red cones; affects about 1% of men; ΔE 72.8 from the original

Deuteranopia#AE9B0Eno green cones; the most common form, about 1% of men; ΔE 73.2 from the original

Tritanopia#FF0042no blue cones; rare, and affects men and women equally; ΔE 26.4 from the original

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

Contrast with white, large text3.37:1WCAG large text: AA

Contrast with black, large text6.22:1WCAG large text: AAA

Named colours

Orange red · ΔE 7.8 Red · ΔE 15.4 Tomato · ΔE 17.7 Coral · ΔE 27 Crimson · ΔE 30.1 Chocolate · ΔE 30.1

Nearest named CSS colourOrange red (#FF4500)ΔE 7.83, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#1FD5FF

Analogous#FF1F65, #FFB91F

Triadic#1FFF49, #491FFF

Split complementary#1FFFB9, #1F65FF

Tetradic#65FF1F, #1FD5FF, #B91FFF

Tints, shades & saturation

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

Lighter +40%#FFEFEB

Lighter +30%#FFC5B8

Lighter +20%#FF9C85

Lighter +10%#FF7252

Darker −10%#EB2C00

Darker −20%#B82300

Darker −30%#851900

Darker −40%#520F00

More saturated +25%#FF491F

Less saturated −25%#E35B3B

Channel breakdown

R255

G73

B31

Red255 (100%)

Green73 (28.6%)

Blue31 (12.2%)

Hue11.25°

Saturation (HSL)100%

Lightness56.08%

Dominant channelRed

Hex per channelR FF · G 49 · B 1F

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF491F (chemical formula)

Formula
9,366.014 g/mol
493 atoms

FF491F has a molar mass of 9,366.014 g/mol, made up of 493 atoms across 1 element: 493 × F.

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Molar mass

Molar mass9,366.014 g/mol

Total atoms per molecule493

Distinct elements1

Mass of one molecule1.5552632 × 10^-20 g

Molecules per gram6.4297798 × 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

F100%

Fluorine (F × 493)9,366.014 g/mol, 100%

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Elements in this formula

Fluorine

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