Recognised as Colour

#FF5B19

#FF5B19
Orange
Dark
Nearest: Orange red

#FF5B19 is a orange with RGB values 255, 91, 25 and HSL 17°, 100%, 55%. It is a dark colour, so black text on it reaches 6.8:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#FF5B19#FF5B19

HEX#FF5B19

RGBrgb(255, 91, 25)

RGB (0–1)1, 0.3569, 0.098

RGB percentages100%, 35.7%, 9.8%

HSLhsl(17.2, 100%, 54.9%)

HSV / HSBhsv(17.2, 90.2%, 100%)

CMYK0%, 64.3%, 90.2%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,735,001

CSS custom property--colour: #FF5B19;

Brightness & contrast

Relative luminance0.28812WCAG 2.x, 0 is black and 1 is white

Perceived brightness156.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.76:1

Contrast with white3.11:1WCAG normal text: Fail

Contrast with black6.76:1WCAG normal text: AA

Greyscale equivalent#797979

Inverted#00A4E6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#8C7B04no red cones; affects about 1% of men; ΔE 65.6 from the original

Deuteranopia#B4A007no green cones; the most common form, about 1% of men; ΔE 66.3 from the original

Tritanopia#FF2750no blue cones; rare, and affects men and women equally; ΔE 36.5 from the original

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

Contrast with white, large text3.11:1WCAG large text: AA

Contrast with black, large text6.76:1WCAG large text: AAA

Named colours

Orange red · ΔE 9.3 Tomato · ΔE 18.8 Red · ΔE 21.6 Coral · ΔE 23.8 Chocolate · ΔE 24.7 Dark orange · ΔE 26.8

Nearest named CSS colourOrange red (#FF4500)ΔE 9.31, clearly different but related

Hue familyorange

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#19BDFF

Analogous#FF194A, #FFCE19

Triadic#19FF5B, #5B19FF

Split complementary#19FFCE, #194AFF

Tetradic#4AFF19, #19BDFF, #CE19FF

Tints, shades & saturation

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

Lighter +40%#FFECE5

Lighter +30%#FFC8B2

Lighter +20%#FFA47F

Lighter +10%#FF7F4C

Darker −10%#E54200

Darker −20%#B23300

Darker −30%#7F2400

Darker −40%#4C1600

More saturated +25%#FF5B19

Less saturated −25%#E26736

Channel breakdown

R255

G91

B25

Red255 (100%)

Green91 (35.7%)

Blue25 (9.8%)

Hue17.22°

Saturation (HSL)100%

Lightness54.9%

Dominant channelRed

Hex per channelR FF · G 5B · B 19

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF5B19 (chemical formula)

Formula
319.378 g/mol
25 atoms

FF5B19 has a molar mass of 319.378 g/mol, made up of 25 atoms across 2 elements: 6 × F, 19 × B.

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Molar mass

Molar mass319.378 g/mol

Total atoms per molecule25

Distinct elements2

Mass of one molecule5.3033965 × 10^-22 g

Molecules per gram1.8855841 × 10^21

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

F35.7%

B64.3%

Fluorine (F × 6)113.988 g/mol, 35.691%

Boron (B × 19)205.39 g/mol, 64.309%

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