Recognised as Colour

#FB1544

#FB1544
Red
Dark
Nearest: Crimson

#FB1544 is a red with RGB values 251, 21, 68 and HSL 348°, 97%, 53%. It is a dark colour, so black text on it reaches 5.3:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FB1544#FB1544

HEX#FB1544

RGBrgb(251, 21, 68)

RGB (0–1)0.9843, 0.0824, 0.2667

RGB percentages98.4%, 8.2%, 26.7%

HSLhsl(347.7, 96.6%, 53.3%)

HSV / HSBhsv(347.7, 91.6%, 98.4%)

CMYK0%, 91.6%, 72.9%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,454,980

CSS custom property--colour: #FB1544;

Brightness & contrast

Relative luminance0.21463WCAG 2.x, 0 is black and 1 is white

Perceived brightness140.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.29:1

Contrast with white3.97:1WCAG normal text: Fail

Contrast with black5.29:1WCAG normal text: AA

Greyscale equivalent#494949

Inverted#04EABB

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6A6243no red cones; affects about 1% of men; ΔE 83.8 from the original

Deuteranopia#9F903Cno green cones; the most common form, about 1% of men; ΔE 84.2 from the original

Tritanopia#FF002Eno blue cones; rare, and affects men and women equally; ΔE 12.6 from the original

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

Contrast with white, large text3.97:1WCAG large text: AA

Contrast with black, large text5.29:1WCAG large text: AAA

Named colours

Crimson · ΔE 11 Tomato · ΔE 24.1 Firebrick · ΔE 26.9 Red · ΔE 29.3 Orange red · ΔE 33.1 Brown · ΔE 33.9

Nearest named CSS colourCrimson (#DC143C)ΔE 10.99, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#15FBCC

Analogous#FB15B7, #FB5915

Triadic#44FB15, #1544FB

Split complementary#15FB59, #15B7FB

Tetradic#B7FB15, #15FBCC, #5915FB

Tints, shades & saturation

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

Lighter +40%#FEDEE4

Lighter +30%#FEABBC

Lighter +20%#FD7994

Lighter +10%#FC476C

Darker −10%#D9042F

Darker −20%#A70324

Darker −30%#750219

Darker −40%#43010F

More saturated +25%#FF1142

Less saturated −25%#DD3356

Channel breakdown

R251

G21

B68

Red251 (98.4%)

Green21 (8.2%)

Blue68 (26.7%)

Hue347.74°

Saturation (HSL)96.64%

Lightness53.33%

Dominant channelRed

Hex per channelR FB · G 15 · B 44

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB1544 (chemical formula)

Formula
16,709.638 g/mol
1545 atoms

FB1544 has a molar mass of 16,709.638 g/mol, made up of 1545 atoms across 2 elements: 1 × F, 1544 × B.

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Molar mass

Molar mass16,709.638 g/mol

Total atoms per molecule1545

Distinct elements2

Mass of one molecule2.7747007 × 10^-20 g

Molecules per gram3.6039924 × 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, 0.114%

Boron (B × 1544)16,690.64 g/mol, 99.886%

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