Recognised as Colour

#FF2550

#FF2550
Red
Dark
Nearest: Crimson

#FF2550 is a red with RGB values 255, 37, 80 and HSL 348°, 100%, 57%. It is a dark colour, so black text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FF2550#FF2550

HEX#FF2550

RGBrgb(255, 37, 80)

RGB (0–1)1, 0.1451, 0.3137

RGB percentages100%, 14.5%, 31.4%

HSLhsl(348.2, 100%, 57.3%)

HSV / HSBhsv(348.2, 85.5%, 100%)

CMYK0%, 85.5%, 68.6%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,721,232

CSS custom property--colour: #FF2550;

Brightness & contrast

Relative luminance0.23162WCAG 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 5.63:1

Contrast with white3.73:1WCAG normal text: Fail

Contrast with black5.63:1WCAG normal text: AA

Greyscale equivalent#565656

Inverted#00DAAF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6E6750no red cones; affects about 1% of men; ΔE 82.2 from the original

Deuteranopia#A39449no green cones; the most common form, about 1% of men; ΔE 82.8 from the original

Tritanopia#FF003Ano blue cones; rare, and affects men and women equally; ΔE 11.3 from the original

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

Contrast with white, large text3.73:1WCAG large text: AA

Contrast with black, large text5.63:1WCAG large text: AAA

Named colours

Crimson · ΔE 10.7 Tomato · ΔE 24.9 Firebrick · ΔE 27.5 Brown · ΔE 33.3 Red · ΔE 34.1 Indian red · ΔE 34.9

Nearest named CSS colourCrimson (#DC143C)ΔE 10.71, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#25FFD4

Analogous#FF25BD, #FF6725

Triadic#50FF25, #2550FF

Split complementary#25FF67, #25BDFF

Tetradic#BDFF25, #25FFD4, #6725FF

Tints, shades & saturation

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

Lighter +40%#FFF1F4

Lighter +30%#FFBECB

Lighter +20%#FF8BA2

Lighter +10%#FF5879

Darker −10%#F10030

Darker −20%#BE0025

Darker −30%#8B001B

Darker −40%#580011

More saturated +25%#FF2550

Less saturated −25%#E44061

Channel breakdown

R255

G37

B80

Red255 (100%)

Green37 (14.5%)

Blue80 (31.4%)

Hue348.17°

Saturation (HSL)100%

Lightness57.25%

Dominant channelRed

Hex per channelR FF · G 25 · B 50

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF2550 (chemical formula)

Formula
48,463.898 g/mol
2551 atoms

FF2550 has a molar mass of 48,463.898 g/mol, made up of 2551 atoms across 1 element: 2551 × F.

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Molar mass

Molar mass48,463.898 g/mol

Total atoms per molecule2551

Distinct elements1

Mass of one molecule8.0476196 × 10^-20 g

Molecules per gram1.2426035 × 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 × 2551)48,463.898 g/mol, 100%

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Elements in this formula

Fluorine

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