Recognised as Colour

#F30031

#F30031
Red
Dark
Nearest: Crimson

#F30031 is a red with RGB values 243, 0, 49 and HSL 348°, 100%, 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 Crimson.

Colour values

#F30031#F30031

HEX#F30031

RGBrgb(243, 0, 49)

RGB (0–1)0.9529, 0, 0.1922

RGB percentages95.3%, 0%, 19.2%

HSLhsl(347.9, 100%, 47.6%)

HSV / HSBhsv(347.9, 100%, 95.3%)

CMYK0%, 100%, 79.8%, 4.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer15,925,297

CSS custom property--colour: #F30031;

Brightness & contrast

Relative luminance0.19276WCAG 2.x, 0 is black and 1 is white

Perceived brightness133.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 4.86:1

Contrast with white4.33:1WCAG normal text: Fail

Contrast with black4.86:1WCAG normal text: AA

Greyscale equivalent#373737

Inverted#0CFFCE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#655B2Fno red cones; affects about 1% of men; ΔE 83.6 from the original

Deuteranopia#9A8A26no green cones; the most common form, about 1% of men; ΔE 83.7 from the original

Tritanopia#FF001Fno blue cones; rare, and affects men and women equally; ΔE 12.5 from the original

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

Contrast with white, large text4.33:1WCAG large text: AA

Contrast with black, large text4.86:1WCAG large text: AAA

Named colours

Crimson · ΔE 14.5 Red · ΔE 21.8 Tomato · ΔE 23 Firebrick · ΔE 26.3 Orange red · ΔE 26.3 Brown · ΔE 34.7

Nearest named CSS colourCrimson (#DC143C)ΔE 14.48, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00F3C2

Analogous#F300AB, #F34800

Triadic#31F300, #0031F3

Split complementary#00F348, #00ABF3

Tetradic#ABF300, #00F3C2, #4800F3

Tints, shades & saturation

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

Lighter +40%#FFC0CD

Lighter +30%#FF8DA4

Lighter +20%#FF5A7B

Lighter +10%#FF2753

Darker −10%#C00027

Darker −20%#8D001C

Darker −30%#5A0012

Darker −40%#270008

More saturated +25%#F30031

Less saturated −25%#D51E43

Channel breakdown

R243

B49

Red243 (95.3%)

Green0 (0%)

Blue49 (19.2%)

Hue347.9°

Saturation (HSL)100%

Lightness47.65%

Dominant channelRed

Hex per channelR F3 · G 00 · B 31

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Harmonies

Lighter and darker

Similar named colours

Also reads as

F30031 (chemical formula)

Formula
570,528.938 g/mol
30031 atoms

F30031 has a molar mass of 570,528.938 g/mol, made up of 30031 atoms across 1 element: 30031 × F.

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Molar mass

Molar mass570,528.938 g/mol

Total atoms per molecule30031

Distinct elements1

Mass of one molecule9.4738559 × 10^-19 g

Molecules per gram1.0555364 × 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 × 30031)570,528.938 g/mol, 100%

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Elements in this formula

Fluorine

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