Recognised as Colour

#FB2519

#FB2519
Red
Dark
Nearest: Red

#FB2519 is a red with RGB values 251, 37, 25 and HSL 3°, 97%, 54%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FB2519#FB2519

HEX#FB2519

RGBrgb(251, 37, 25)

RGB (0–1)0.9843, 0.1451, 0.098

RGB percentages98.4%, 14.5%, 9.8%

HSLhsl(3.2, 96.6%, 54.1%)

HSV / HSBhsv(3.2, 90%, 98.4%)

CMYK0%, 85.3%, 90%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,459,033

CSS custom property--colour: #FB2519;

Brightness & contrast

Relative luminance0.21903WCAG 2.x, 0 is black and 1 is white

Perceived brightness140.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.38:1

Contrast with white3.9:1WCAG normal text: Fail

Contrast with black5.38:1WCAG normal text: AA

Greyscale equivalent#525252

Inverted#04DAE6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#716311no red cones; affects about 1% of men; ΔE 81.1 from the original

Deuteranopia#A39100no green cones; the most common form, about 1% of men; ΔE 81.4 from the original

Tritanopia#FF0027no blue cones; rare, and affects men and women equally; ΔE 8.1 from the original

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

Contrast with white, large text3.9:1WCAG large text: AA

Contrast with black, large text5.38:1WCAG large text: AAA

Named colours

Red · ΔE 8.6 Orange red · ΔE 12.1 Tomato · ΔE 23.6 Crimson · ΔE 27.7 Firebrick · ΔE 33.1 Coral · ΔE 35.1

Nearest named CSS colourRed (#FF0000)ΔE 8.64, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#19EFFB

Analogous#FB197E, #FB9619

Triadic#19FB25, #2519FB

Split complementary#19FB96, #197EFB

Tetradic#7EFB19, #19EFFB, #9619FB

Tints, shades & saturation

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

Lighter +40%#FEE3E2

Lighter +30%#FEB4AF

Lighter +20%#FD847D

Lighter +10%#FC554B

Darker −10%#DD0F04

Darker −20%#AB0C03

Darker −30%#790802

Darker −40%#470501

More saturated +25%#FF2115

Less saturated −25%#DE3F36

Channel breakdown

R251

G37

B25

Red251 (98.4%)

Green37 (14.5%)

Blue25 (9.8%)

Hue3.19°

Saturation (HSL)96.58%

Lightness54.12%

Dominant channelRed

Hex per channelR FB · G 25 · B 19

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB2519 (chemical formula)

Formula
27,249.388 g/mol
2520 atoms

FB2519 has a molar mass of 27,249.388 g/mol, made up of 2520 atoms across 2 elements: 1 × F, 2519 × B.

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Molar mass

Molar mass27,249.388 g/mol

Total atoms per molecule2520

Distinct elements2

Mass of one molecule4.5248673 × 10^-20 g

Molecules per gram2.2100095 × 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

F0.1%

B99.9%

Fluorine (F)18.998 g/mol, 0.07%

Boron (B × 2519)27,230.39 g/mol, 99.93%

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Elements in this formula

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