Recognised as Colour

#FF3109

#FF3109
Red
Dark
Nearest: Orange red

#FF3109 is a red with RGB values 255, 49, 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

#FF3109#FF3109

HEX#FF3109

RGBrgb(255, 49, 9)

RGB (0–1)1, 0.1922, 0.0353

RGB percentages100%, 19.2%, 3.5%

HSLhsl(9.8, 100%, 51.8%)

HSV / HSBhsv(9.8, 96.5%, 100%)

CMYK0%, 80.8%, 96.5%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,724,233

CSS custom property--colour: #FF3109;

Brightness & contrast

Relative luminance0.23476WCAG 2.x, 0 is black and 1 is white

Perceived brightness144.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.7:1

Contrast with white3.69:1WCAG normal text: Fail

Contrast with black5.7:1WCAG normal text: AA

Greyscale equivalent#5A5A5A

Inverted#00CEF6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#776800no red cones; affects about 1% of men; ΔE 79.8 from the original

Deuteranopia#A89500no green cones; the most common form, about 1% of men; ΔE 79.6 from the original

Tritanopia#FF002Eno blue cones; rare, and affects men and women equally; ΔE 17.3 from the original

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

Contrast with white, large text3.69:1WCAG large text: AA

Contrast with black, large text5.7:1WCAG large text: AAA

Named colours

Orange red · ΔE 6.7 Red · ΔE 7 Tomato · ΔE 26 Crimson · ΔE 33.7 Coral · ΔE 35.8 Firebrick · ΔE 37.3

Nearest named CSS colourOrange red (#FF4500)ΔE 6.74, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#09D7FF

Analogous#FF095C, #FFAC09

Triadic#09FF31, #3109FF

Split complementary#09FFAC, #095CFF

Tetradic#5CFF09, #09D7FF, #AC09FF

Tints, shades & saturation

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

Lighter +40%#FFDCD5

Lighter +30%#FFB1A2

Lighter +20%#FF866F

Lighter +10%#FF5C3C

Darker −10%#D52300

Darker −20%#A21A00

Darker −30%#6F1200

Darker −40%#3C0A00

More saturated +25%#FF3109

Less saturated −25%#E04628

Channel breakdown

R255

G49

Red255 (100%)

Green49 (19.2%)

Blue9 (3.5%)

Hue9.76°

Saturation (HSL)100%

Lightness51.76%

Dominant channelRed

Hex per channelR FF · G 31 · B 09

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF3109 (chemical formula)

Formula
59,083.78 g/mol
3110 atoms

FF3109 has a molar mass of 59,083.78 g/mol, made up of 3110 atoms across 1 element: 3110 × F.

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Molar mass

Molar mass59,083.78 g/mol

Total atoms per molecule3110

Distinct elements1

Mass of one molecule9.8110925 × 10^-20 g

Molecules per gram1.0192545 × 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 × 3110)59,083.78 g/mol, 100%

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Elements in this formula

Fluorine

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