Recognised as Colour

#FF554B

#FF554B
Red
Dark
Nearest: Tomato

#FF554B is a red with RGB values 255, 85, 75 and HSL 3°, 100%, 65%. It is a dark colour, so black text on it reaches 6.7:1 contrast (AA for normal text). The nearest named colour is Tomato.

Colour values

#FF554B#FF554B

HEX#FF554B

RGBrgb(255, 85, 75)

RGB (0–1)1, 0.3333, 0.2941

RGB percentages100%, 33.3%, 29.4%

HSLhsl(3.3, 100%, 64.7%)

HSV / HSBhsv(3.3, 70.6%, 100%)

CMYK0%, 66.7%, 70.6%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,733,515

CSS custom property--colour: #FF554B;

Brightness & contrast

Relative luminance0.28265WCAG 2.x, 0 is black and 1 is white

Perceived brightness156 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.65:1

Contrast with white3.16:1WCAG normal text: Fail

Contrast with black6.65:1WCAG normal text: AA

Greyscale equivalent#787878

Inverted#00AAB4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#857A49no red cones; affects about 1% of men; ΔE 68.8 from the original

Deuteranopia#AF9F45no green cones; the most common form, about 1% of men; ΔE 69.6 from the original

Tritanopia#FF2354no blue cones; rare, and affects men and women equally; ΔE 19 from the original

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

Contrast with white, large text3.16:1WCAG large text: AA

Contrast with black, large text6.65:1WCAG large text: AAA

Named colours

Tomato · ΔE 7.7 Crimson · ΔE 17.1 Coral · ΔE 20.5 Firebrick · ΔE 22.8 Salmon · ΔE 23.6 Orange red · ΔE 27.4

Nearest named CSS colourTomato (#FF6347)ΔE 7.68, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#4BF5FF

Analogous#FF4B9B, #FFAF4B

Triadic#4BFF55, #554BFF

Split complementary#4BFFAF, #4B9BFF

Tetradic#9BFF4B, #4BF5FF, #AF4BFF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFE5E4

Lighter +20%#FFB5B1

Lighter +10%#FF857E

Darker −10%#FF2518

Darker −20%#E40D00

Darker −30%#B10A00

Darker −40%#7E0700

More saturated +25%#FF554B

Less saturated −25%#E96961

Channel breakdown

R255

G85

B75

Red255 (100%)

Green85 (33.3%)

Blue75 (29.4%)

Hue3.33°

Saturation (HSL)100%

Lightness64.71%

Dominant channelRed

Hex per channelR FF · G 55 · B 4B

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF554B (chemical formula)

Formula
10,554.7 g/mol
556 atoms

FF554B has a molar mass of 10,554.7 g/mol, made up of 556 atoms across 2 elements: 555 × F, 1 × B.

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Molar mass

Molar mass10,554.7 g/mol

Total atoms per molecule556

Distinct elements2

Mass of one molecule1.7526492 × 10^-20 g

Molecules per gram5.7056484 × 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 × 555)10,543.89 g/mol, 99.898%

Boron (B)10.81 g/mol, 0.102%

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Elements in this formula

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