Recognised as Colour

#FB1723

#FB1723
Red
Dark
Nearest: Red

#FB1723 is a red with RGB values 251, 23, 35 and HSL 357°, 97%, 54%. It is a dark colour, so black text on it reaches 5.2:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FB1723#FB1723

HEX#FB1723

RGBrgb(251, 23, 35)

RGB (0–1)0.9843, 0.0902, 0.1373

RGB percentages98.4%, 9%, 13.7%

HSLhsl(356.8, 96.6%, 53.7%)

HSV / HSBhsv(356.8, 90.8%, 98.4%)

CMYK0%, 90.8%, 86.1%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,455,459

CSS custom property--colour: #FB1723;

Brightness & contrast

Relative luminance0.21243WCAG 2.x, 0 is black and 1 is white

Perceived brightness138.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.25:1

Contrast with white4:1WCAG normal text: Fail

Contrast with black5.25:1WCAG normal text: AA

Greyscale equivalent#484848

Inverted#04E8DC

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6D611Fno red cones; affects about 1% of men; ΔE 83.9 from the original

Deuteranopia#A18F10no green cones; the most common form, about 1% of men; ΔE 83.4 from the original

Tritanopia#FF0021no blue cones; rare, and affects men and women equally; ΔE 3.2 from the original

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

Contrast with white, large text4:1WCAG large text: AA

Contrast with black, large text5.25:1WCAG large text: AAA

Named colours

Red · ΔE 12.1 Orange red · ΔE 17.3 Tomato · ΔE 23.4 Crimson · ΔE 23.6 Firebrick · ΔE 31.3 Coral · ΔE 36

Nearest named CSS colourRed (#FF0000)ΔE 12.1, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#17FBEF

Analogous#FB1795, #FB7D17

Triadic#23FB17, #1723FB

Split complementary#17FB7D, #1795FB

Tetradic#95FB17, #17FBEF, #7D17FB

Tints, shades & saturation

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

Lighter +40%#FEE0E1

Lighter +30%#FEADB2

Lighter +20%#FD7B82

Lighter +10%#FC4953

Darker −10%#DB040F

Darker −20%#A9030C

Darker −30%#770208

Darker −40%#450105

More saturated +25%#FF131F

Less saturated −25%#DD353D

Channel breakdown

R251

G23

B35

Red251 (98.4%)

Green23 (9%)

Blue35 (13.7%)

Hue356.84°

Saturation (HSL)96.61%

Lightness53.73%

Dominant channelRed

Hex per channelR FB · G 17 · B 23

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB1723 (chemical formula)

Formula
18,644.628 g/mol
1724 atoms

FB1723 has a molar mass of 18,644.628 g/mol, made up of 1724 atoms across 2 elements: 1 × F, 1723 × B.

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Molar mass

Molar mass18,644.628 g/mol

Total atoms per molecule1724

Distinct elements2

Mass of one molecule3.0960133 × 10^-20 g

Molecules per gram3.2299603 × 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, 0.102%

Boron (B × 1723)18,625.63 g/mol, 99.898%

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Elements in this formula

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