Recognised as Colour

#FF5B50

#FF5B50
Red
Dark
Nearest: Tomato

#FF5B50 is a red with RGB values 255, 91, 80 and HSL 4°, 100%, 66%. It is a dark colour, so black text on it reaches 6.9:1 contrast (AA for normal text). The nearest named colour is Tomato.

Colour values

#FF5B50#FF5B50

HEX#FF5B50

RGBrgb(255, 91, 80)

RGB (0–1)1, 0.3569, 0.3137

RGB percentages100%, 35.7%, 31.4%

HSLhsl(3.8, 100%, 65.7%)

HSV / HSBhsv(3.8, 68.6%, 100%)

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

24-bit integer16,735,056

CSS custom property--colour: #FF5B50;

Brightness & contrast

Relative luminance0.29321WCAG 2.x, 0 is black and 1 is white

Perceived brightness158.2 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.86:1

Contrast with white3.06:1WCAG normal text: Fail

Contrast with black6.86:1WCAG normal text: AA

Greyscale equivalent#7D7D7D

Inverted#00A4AF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#887D4Eno red cones; affects about 1% of men; ΔE 66.4 from the original

Deuteranopia#B1A14Bno green cones; the most common form, about 1% of men; ΔE 67.2 from the original

Tritanopia#FF315Ano blue cones; rare, and affects men and women equally; ΔE 18.9 from the original

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

Contrast with white, large text3.06:1WCAG large text: AA

Contrast with black, large text6.86:1WCAG large text: AAA

Named colours

Tomato · ΔE 7.3 Crimson · ΔE 18.1 Coral · ΔE 18.8 Salmon · ΔE 20.8 Firebrick · ΔE 22.8 Indian red · ΔE 25.9

Nearest named CSS colourTomato (#FF6347)ΔE 7.27, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#50F4FF

Analogous#FF509C, #FFB350

Triadic#50FF5B, #5B50FF

Split complementary#50FFB3, #509CFF

Tetradic#9CFF50, #50F4FF, #B350FF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFEAE9

Lighter +20%#FFBBB6

Lighter +10%#FF8B83

Darker −10%#FF2B1D

Darker −20%#E90F00

Darker −30%#B60B00

Darker −40%#830800

More saturated +25%#FF5B50

Less saturated −25%#E96E66

Channel breakdown

R255

G91

B80

Red255 (100%)

Green91 (35.7%)

Blue80 (31.4%)

Hue3.77°

Saturation (HSL)100%

Lightness65.69%

Dominant channelRed

Hex per channelR FF · G 5B · B 50

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF5B50 (chemical formula)

Formula
654.488 g/mol
56 atoms

FF5B50 has a molar mass of 654.488 g/mol, made up of 56 atoms across 2 elements: 6 × F, 50 × B.

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Molar mass

Molar mass654.488 g/mol

Total atoms per molecule56

Distinct elements2

Mass of one molecule1.0868029 × 10^-21 g

Molecules per gram9.2013005 × 10^20

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

F17.4%

B82.6%

Fluorine (F × 6)113.988 g/mol, 17.416%

Boron (B × 50)540.5 g/mol, 82.584%

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Elements in this formula

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