Recognised as Colour

#F31001

#F31001
Red
Dark
Nearest: Red

#F31001 is a red with RGB values 243, 16, 1 and HSL 4°, 99%, 48%. It is a dark colour, so black text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#F31001#F31001

HEX#F31001

RGBrgb(243, 16, 1)

RGB (0–1)0.9529, 0.0627, 0.0039

RGB percentages95.3%, 6.3%, 0.4%

HSLhsl(3.7, 99.2%, 47.8%)

HSV / HSBhsv(3.7, 99.6%, 95.3%)

CMYK0%, 93.4%, 99.6%, 4.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer15,929,345

CSS custom property--colour: #F31001;

Brightness & contrast

Relative luminance0.19427WCAG 2.x, 0 is black and 1 is white

Perceived brightness133.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 4.89:1

Contrast with white4.3:1WCAG normal text: Fail

Contrast with black4.89:1WCAG normal text: AA

Greyscale equivalent#3F3F3F

Inverted#0CEFFE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#695C00no red cones; affects about 1% of men; ΔE 82.7 from the original

Deuteranopia#9C8A00no green cones; the most common form, about 1% of men; ΔE 81.6 from the original

Tritanopia#FF0016no blue cones; rare, and affects men and women equally; ΔE 5.9 from the original

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

Contrast with white, large text4.3:1WCAG large text: AA

Contrast with black, large text4.89:1WCAG large text: AAA

Named colours

Red · ΔE 5.2 Orange red · ΔE 11.2 Tomato · ΔE 28 Crimson · ΔE 31.8 Firebrick · ΔE 35.8 Coral · ΔE 38.6

Nearest named CSS colourRed (#FF0000)ΔE 5.24, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#01E4F3

Analogous#F3016B, #F38901

Triadic#01F310, #1001F3

Split complementary#01F389, #016BF3

Tetradic#6BF301, #01E4F3, #8901F3

Tints, shades & saturation

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

Lighter +40%#FFC5C1

Lighter +30%#FF958E

Lighter +20%#FE665C

Lighter +10%#FE3629

Darker −10%#C00D01

Darker −20%#8D0901

Darker −30%#5B0600

Darker −40%#280300

More saturated +25%#F40F00

Less saturated −25%#D42B20

Channel breakdown

R243

G16

Red243 (95.3%)

Green16 (6.3%)

Blue1 (0.4%)

Hue3.72°

Saturation (HSL)99.18%

Lightness47.84%

Dominant channelRed

Hex per channelR F3 · G 10 · B 01

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Harmonies

Lighter and darker

Similar named colours

Also reads as

F31001 (chemical formula)

Formula
588,956.998 g/mol
31001 atoms

F31001 has a molar mass of 588,956.998 g/mol, made up of 31001 atoms across 1 element: 31001 × F.

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Molar mass

Molar mass588,956.998 g/mol

Total atoms per molecule31001

Distinct elements1

Mass of one molecule9.779861 × 10^-19 g

Molecules per gram1.0225094 × 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 × 31001)588,956.998 g/mol, 100%

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Elements in this formula

Fluorine

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