Recognised as Colour

#FF280B

#FF280B
Red
Dark
Nearest: Red

#FF280B is a red with RGB values 255, 40, 11 and HSL 7°, 100%, 52%. It is a dark colour, so black text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FF280B#FF280B

HEX#FF280B

RGBrgb(255, 40, 11)

RGB (0–1)1, 0.1569, 0.0431

RGB percentages100%, 15.7%, 4.3%

HSLhsl(7.1, 100%, 52.2%)

HSV / HSBhsv(7.1, 95.7%, 100%)

CMYK0%, 84.3%, 95.7%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,721,931

CSS custom property--colour: #FF280B;

Brightness & contrast

Relative luminance0.22802WCAG 2.x, 0 is black and 1 is white

Perceived brightness142.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.56:1

Contrast with white3.78:1WCAG normal text: Fail

Contrast with black5.56:1WCAG normal text: AA

Greyscale equivalent#545454

Inverted#00D7F4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#746600no red cones; affects about 1% of men; ΔE 82.1 from the original

Deuteranopia#A79400no green cones; the most common form, about 1% of men; ΔE 81.5 from the original

Tritanopia#FF0027no blue cones; rare, and affects men and women equally; ΔE 12.5 from the original

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

Contrast with white, large text3.78:1WCAG large text: AA

Contrast with black, large text5.56:1WCAG large text: AAA

Named colours

Red · ΔE 5.2 Orange red · ΔE 9 Tomato · ΔE 26.9 Crimson · ΔE 33 Coral · ΔE 37.2 Firebrick · ΔE 37.4

Nearest named CSS colourRed (#FF0000)ΔE 5.19, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#0BE2FF

Analogous#FF0B68, #FFA20B

Triadic#0BFF28, #280BFF

Split complementary#0BFFA2, #0B68FF

Tetradic#68FF0B, #0BE2FF, #A20BFF

Tints, shades & saturation

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

Lighter +40%#FFDCD7

Lighter +30%#FFAFA4

Lighter +20%#FF8271

Lighter +10%#FF553E

Darker −10%#D71A00

Darker −20%#A41300

Darker −30%#710D00

Darker −40%#3E0700

More saturated +25%#FF280B

Less saturated −25%#E13F29

Channel breakdown

R255

G40

B11

Red255 (100%)

Green40 (15.7%)

Blue11 (4.3%)

Hue7.13°

Saturation (HSL)100%

Lightness52.16%

Dominant channelRed

Hex per channelR FF · G 28 · B 0B

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF280B (chemical formula)

Formula
5,349.248 g/mol
282 atoms

FF280B has a molar mass of 5,349.248 g/mol, made up of 282 atoms across 2 elements: 281 × F, 1 × B.

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Molar mass

Molar mass5,349.248 g/mol

Total atoms per molecule282

Distinct elements2

Mass of one molecule8.8826353 × 10^-21 g

Molecules per gram1.125792 × 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

F99.8%

B0.2%

Fluorine (F × 281)5,338.438 g/mol, 99.798%

Boron (B)10.81 g/mol, 0.202%

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Elements in this formula

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