Recognised as Colour

#FF505B

#FF505B
Red
Dark
Nearest: Crimson

#FF505B is a red with RGB values 255, 80, 91 and HSL 356°, 100%, 66%. It is a dark colour, so black text on it reaches 6.6:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FF505B#FF505B

HEX#FF505B

RGBrgb(255, 80, 91)

RGB (0–1)1, 0.3137, 0.3569

RGB percentages100%, 31.4%, 35.7%

HSLhsl(356.2, 100%, 65.7%)

HSV / HSBhsv(356.2, 68.6%, 100%)

CMYK0%, 68.6%, 64.3%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,732,251

CSS custom property--colour: #FF505B;

Brightness & contrast

Relative luminance0.27753WCAG 2.x, 0 is black and 1 is white

Perceived brightness155.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.55:1

Contrast with white3.21:1WCAG normal text: Fail

Contrast with black6.55:1WCAG normal text: AA

Greyscale equivalent#767676

Inverted#00AFA4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#80785Ano red cones; affects about 1% of men; ΔE 70.6 from the original

Deuteranopia#AC9D56no green cones; the most common form, about 1% of men; ΔE 71.1 from the original

Tritanopia#FF1C56no blue cones; rare, and affects men and women equally; ΔE 14.3 from the original

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

Contrast with white, large text3.21:1WCAG large text: AA

Contrast with black, large text6.55:1WCAG large text: AAA

Named colours

Crimson · ΔE 13.5 Tomato · ΔE 16.6 Salmon · ΔE 22.7 Firebrick · ΔE 23.7 Indian red · ΔE 24.7 Coral · ΔE 27

Nearest named CSS colourCrimson (#DC143C)ΔE 13.47, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#50FFF4

Analogous#FF50B3, #FF9C50

Triadic#5BFF50, #505BFF

Split complementary#50FF9C, #50B3FF

Tetradic#B3FF50, #50FFF4, #9C50FF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFE9EA

Lighter +20%#FFB6BB

Lighter +10%#FF838B

Darker −10%#FF1D2B

Darker −20%#E9000F

Darker −30%#B6000B

Darker −40%#830008

More saturated +25%#FF505B

Less saturated −25%#E9666E

Channel breakdown

R255

G80

B91

Red255 (100%)

Green80 (31.4%)

Blue91 (35.7%)

Hue356.23°

Saturation (HSL)100%

Lightness65.69%

Dominant channelRed

Hex per channelR FF · G 50 · B 5B

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF505B (chemical formula)

Formula
9,623.798 g/mol
507 atoms

FF505B has a molar mass of 9,623.798 g/mol, made up of 507 atoms across 2 elements: 506 × F, 1 × B.

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Molar mass

Molar mass9,623.798 g/mol

Total atoms per molecule507

Distinct elements2

Mass of one molecule1.5980693 × 10^-20 g

Molecules per gram6.2575511 × 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

F99.9%

B0.1%

Fluorine (F × 506)9,612.988 g/mol, 99.888%

Boron (B)10.81 g/mol, 0.112%

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Elements in this formula

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