Recognised as Colour

#FF511C

#FF511C
Red
Dark
Nearest: Orange red

#FF511C is a red with RGB values 255, 81, 28 and HSL 14°, 100%, 55%. It is a dark colour, so black text on it reaches 6.4:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#FF511C#FF511C

HEX#FF511C

RGBrgb(255, 81, 28)

RGB (0–1)1, 0.3176, 0.1098

RGB percentages100%, 31.8%, 11%

HSLhsl(14, 100%, 55.5%)

HSV / HSBhsv(14, 89%, 100%)

CMYK0%, 68.2%, 89%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,732,444

CSS custom property--colour: #FF511C;

Brightness & contrast

Relative luminance0.27229WCAG 2.x, 0 is black and 1 is white

Perceived brightness152.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.45:1

Contrast with white3.26:1WCAG normal text: Fail

Contrast with black6.45:1WCAG normal text: AA

Greyscale equivalent#727272

Inverted#00AEE3

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#86760Eno red cones; affects about 1% of men; ΔE 69.7 from the original

Deuteranopia#B09D0Ano green cones; the most common form, about 1% of men; ΔE 70.4 from the original

Tritanopia#FF0048no blue cones; rare, and affects men and women equally; ΔE 32.6 from the original

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

Contrast with white, large text3.26:1WCAG large text: AA

Contrast with black, large text6.45:1WCAG large text: AAA

Named colours

Orange red · ΔE 7.3 Red · ΔE 17.8 Tomato · ΔE 17.9 Coral · ΔE 25.5 Chocolate · ΔE 27.7 Dark orange · ΔE 31.5

Nearest named CSS colourOrange red (#FF4500)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#1CCAFF

Analogous#FF1C58, #FFC31C

Triadic#1CFF51, #511CFF

Split complementary#1CFFC3, #1C58FF

Tetradic#58FF1C, #1CCAFF, #C31CFF

Tints, shades & saturation

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

Lighter +40%#FFEDE8

Lighter +30%#FFC6B5

Lighter +20%#FF9F82

Lighter +10%#FF784F

Darker −10%#E83600

Darker −20%#B52A00

Darker −30%#821E00

Darker −40%#4F1200

More saturated +25%#FF511C

Less saturated −25%#E36038

Channel breakdown

R255

G81

B28

Red255 (100%)

Green81 (31.8%)

Blue28 (11%)

Hue14.01°

Saturation (HSL)100%

Lightness55.49%

Dominant channelRed

Hex per channelR FF · G 51 · B 1C

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF511C (chemical formula)

Formula
9,738.987 g/mol
513 atoms

FF511C has a molar mass of 9,738.987 g/mol, made up of 513 atoms across 2 elements: 512 × F, 1 × C.

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Molar mass

Molar mass9,738.987 g/mol

Total atoms per molecule513

Distinct elements2

Mass of one molecule1.6171968 × 10^-20 g

Molecules per gram6.1835392 × 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%

C0.1%

Fluorine (F × 512)9,726.976 g/mol, 99.877%

Carbon (C)12.011 g/mol, 0.123%

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