Recognised as Colour

#FF3309

#FF3309
Red
Dark
Nearest: Orange red

#FF3309 is a red with RGB values 255, 51, 9 and HSL 10°, 100%, 52%. It is a dark colour, so black text on it reaches 5.7:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#FF3309#FF3309

HEX#FF3309

RGBrgb(255, 51, 9)

RGB (0–1)1, 0.2, 0.0353

RGB percentages100%, 20%, 3.5%

HSLhsl(10.2, 100%, 51.8%)

HSV / HSBhsv(10.2, 96.5%, 100%)

CMYK0%, 80%, 96.5%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,724,745

CSS custom property--colour: #FF3309;

Brightness & contrast

Relative luminance0.23647WCAG 2.x, 0 is black and 1 is white

Perceived brightness144.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.73:1

Contrast with white3.67:1WCAG normal text: Fail

Contrast with black5.73:1WCAG normal text: AA

Greyscale equivalent#5B5B5B

Inverted#00CCF6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#786900no red cones; affects about 1% of men; ΔE 79.3 from the original

Deuteranopia#A99500no green cones; the most common form, about 1% of men; ΔE 78.6 from the original

Tritanopia#FF002Fno blue cones; rare, and affects men and women equally; ΔE 18.1 from the original

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

Contrast with white, large text3.67:1WCAG large text: AA

Contrast with black, large text5.73:1WCAG large text: AAA

Named colours

Orange red · ΔE 6.2 Red · ΔE 7.5 Tomato · ΔE 25.8 Crimson · ΔE 33.8 Coral · ΔE 35.4 Firebrick · ΔE 37.2

Nearest named CSS colourOrange red (#FF4500)ΔE 6.23, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#09D5FF

Analogous#FF095A, #FFAE09

Triadic#09FF33, #3309FF

Split complementary#09FFAE, #095AFF

Tetradic#5AFF09, #09D5FF, #AE09FF

Tints, shades & saturation

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

Lighter +40%#FFDCD5

Lighter +30%#FFB2A2

Lighter +20%#FF886F

Lighter +10%#FF5D3C

Darker −10%#D52400

Darker −20%#A21C00

Darker −30%#6F1300

Darker −40%#3C0A00

More saturated +25%#FF3309

Less saturated −25%#E04728

Channel breakdown

R255

G51

Red255 (100%)

Green51 (20%)

Blue9 (3.5%)

Hue10.24°

Saturation (HSL)100%

Lightness51.76%

Dominant channelRed

Hex per channelR FF · G 33 · B 09

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF3309 (chemical formula)

Formula
62,883.38 g/mol
3310 atoms

FF3309 has a molar mass of 62,883.38 g/mol, made up of 3310 atoms across 1 element: 3310 × F.

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Molar mass

Molar mass62,883.38 g/mol

Total atoms per molecule3310

Distinct elements1

Mass of one molecule1.0442031 × 10^-19 g

Molecules per gram9.5766811 × 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

F100%

Fluorine (F × 3310)62,883.38 g/mol, 100%

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Elements in this formula

Fluorine

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