Recognised as Colour

#FF1840

#FF1840
Red
Dark
Nearest: Crimson

#FF1840 is a red with RGB values 255, 24, 64 and HSL 350°, 100%, 55%. It is a dark colour, so black text on it reaches 5.5:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FF1840#FF1840

HEX#FF1840

RGBrgb(255, 24, 64)

RGB (0–1)1, 0.0941, 0.251

RGB percentages100%, 9.4%, 25.1%

HSLhsl(349.6, 100%, 54.7%)

HSV / HSBhsv(349.6, 90.6%, 100%)

CMYK0%, 90.6%, 74.9%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,717,888

CSS custom property--colour: #FF1840;

Brightness & contrast

Relative luminance0.22283WCAG 2.x, 0 is black and 1 is white

Perceived brightness142.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.46:1

Contrast with white3.85:1WCAG normal text: Fail

Contrast with black5.46:1WCAG normal text: AA

Greyscale equivalent#4C4C4C

Inverted#00E7BF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6C643Fno red cones; affects about 1% of men; ΔE 85.1 from the original

Deuteranopia#A29237no green cones; the most common form, about 1% of men; ΔE 84.8 from the original

Tritanopia#FF002Dno blue cones; rare, and affects men and women equally; ΔE 9.6 from the original

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

Contrast with white, large text3.85:1WCAG large text: AA

Contrast with black, large text5.46:1WCAG large text: AAA

Named colours

Crimson · ΔE 13.5 Tomato · ΔE 23.3 Red · ΔE 25.8 Firebrick · ΔE 28.1 Orange red · ΔE 29.9 Brown · ΔE 35.7

Nearest named CSS colourCrimson (#DC143C)ΔE 13.54, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#18FFD7

Analogous#FF18B4, #FF6418

Triadic#40FF18, #1840FF

Split complementary#18FF64, #18B4FF

Tetradic#B3FF18, #18FFD7, #6318FF

Tints, shades & saturation

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

Lighter +40%#FFE4E9

Lighter +30%#FFB1BF

Lighter +20%#FF7E94

Lighter +10%#FF4B6A

Darker −10%#E40027

Darker −20%#B1001F

Darker −30%#7E0016

Darker −40%#4B000D

More saturated +25%#FF1840

Less saturated −25%#E23553

Channel breakdown

R255

G24

B64

Red255 (100%)

Green24 (9.4%)

Blue64 (25.1%)

Hue349.61°

Saturation (HSL)100%

Lightness54.71%

Dominant channelRed

Hex per channelR FF · G 18 · B 40

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF1840 (chemical formula)

Formula
34,975.318 g/mol
1841 atoms

FF1840 has a molar mass of 34,975.318 g/mol, made up of 1841 atoms across 1 element: 1841 × F.

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Molar mass

Molar mass34,975.318 g/mol

Total atoms per molecule1841

Distinct elements1

Mass of one molecule5.8077882 × 10^-20 g

Molecules per gram1.7218259 × 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 × 1841)34,975.318 g/mol, 100%

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Elements in this formula

Fluorine

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