Recognised as Colour

#FF2B19

#FF2B19
Red
Dark
Nearest: Red

#FF2B19 is a red with RGB values 255, 43, 25 and HSL 5°, 100%, 55%. 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

#FF2B19#FF2B19

HEX#FF2B19

RGBrgb(255, 43, 25)

RGB (0–1)1, 0.1686, 0.098

RGB percentages100%, 16.9%, 9.8%

HSLhsl(4.7, 100%, 54.9%)

HSV / HSBhsv(4.7, 90.2%, 100%)

CMYK0%, 83.1%, 90.2%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,722,713

CSS custom property--colour: #FF2B19;

Brightness & contrast

Relative luminance0.23058WCAG 2.x, 0 is black and 1 is white

Perceived brightness143.5 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.61:1

Contrast with white3.74:1WCAG normal text: Fail

Contrast with black5.61:1WCAG normal text: AA

Greyscale equivalent#575757

Inverted#00D4E6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#746710no red cones; affects about 1% of men; ΔE 81.7 from the original

Deuteranopia#A79400no green cones; the most common form, about 1% of men; ΔE 81.1 from the original

Tritanopia#FF002Bno blue cones; rare, and affects men and women equally; ΔE 11 from the original

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

Contrast with white, large text3.74:1WCAG large text: AA

Contrast with black, large text5.61:1WCAG large text: AAA

Named colours

Red · ΔE 8 Orange red · ΔE 10.9 Tomato · ΔE 23.8 Crimson · ΔE 29.1 Firebrick · ΔE 34.4 Coral · ΔE 34.9

Nearest named CSS colourRed (#FF0000)ΔE 7.99, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#19EDFF

Analogous#FF197A, #FF9E19

Triadic#19FF2B, #2B19FF

Split complementary#19FF9E, #197AFF

Tetradic#7AFF19, #19EDFF, #9E19FF

Tints, shades & saturation

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

Lighter +40%#FFE7E5

Lighter +30%#FFB8B2

Lighter +20%#FF897F

Lighter +10%#FF5A4C

Darker −10%#E51200

Darker −20%#B20E00

Darker −30%#7F0A00

Darker −40%#4C0600

More saturated +25%#FF2B19

Less saturated −25%#E24336

Channel breakdown

R255

G43

B25

Red255 (100%)

Green43 (16.9%)

Blue25 (9.8%)

Hue4.7°

Saturation (HSL)100%

Lightness54.9%

Dominant channelRed

Hex per channelR FF · G 2B · B 19

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF2B19 (chemical formula)

Formula
262.384 g/mol
22 atoms

FF2B19 has a molar mass of 262.384 g/mol, made up of 22 atoms across 2 elements: 3 × F, 19 × B.

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Molar mass

Molar mass262.384 g/mol

Total atoms per molecule22

Distinct elements2

Mass of one molecule4.3569888 × 10^-22 g

Molecules per gram2.2951631 × 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

F21.7%

B78.3%

Fluorine (F × 3)56.994 g/mol, 21.722%

Boron (B × 19)205.39 g/mol, 78.278%

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