Recognised as Colour

#FB1021

#FB1021
Red
Dark
Nearest: Red

#FB1021 is a red with RGB values 251, 16, 33 and HSL 356°, 97%, 52%. 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

#FB1021#FB1021

HEX#FB1021

RGBrgb(251, 16, 33)

RGB (0–1)0.9843, 0.0627, 0.1294

RGB percentages98.4%, 6.3%, 12.9%

HSLhsl(355.7, 96.7%, 52.4%)

HSV / HSBhsv(355.7, 93.6%, 98.4%)

CMYK0%, 93.6%, 86.9%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,453,665

CSS custom property--colour: #FB1021;

Brightness & contrast

Relative luminance0.2099WCAG 2.x, 0 is black and 1 is white

Perceived brightness138.2 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.2:1

Contrast with white4.04:1WCAG normal text: Fail

Contrast with black5.2:1WCAG normal text: AA

Greyscale equivalent#434343

Inverted#04EFDE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6C601Dno red cones; affects about 1% of men; ΔE 84.7 from the original

Deuteranopia#A18F0Cno green cones; the most common form, about 1% of men; ΔE 84.3 from the original

Tritanopia#FF001Eno blue cones; rare, and affects men and women equally; ΔE 2.9 from the original

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

Contrast with white, large text4.04:1WCAG large text: AA

Contrast with black, large text5.2:1WCAG large text: AAA

Named colours

Red · ΔE 11.3 Orange red · ΔE 17.3 Crimson · ΔE 24.4 Tomato · ΔE 24.4 Firebrick · ΔE 32.1 Coral · ΔE 36.9

Nearest named CSS colourRed (#FF0000)ΔE 11.29, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#10FBEA

Analogous#FB1097, #FB7410

Triadic#21FB10, #1021FB

Split complementary#10FB75, #1096FB

Tetradic#96FB10, #10FBEA, #7410FB

Tints, shades & saturation

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

Lighter +40%#FED9DB

Lighter +30%#FEA6AD

Lighter +20%#FD747E

Lighter +10%#FC4250

Darker −10%#D40413

Darker −20%#A2030E

Darker −30%#70020A

Darker −40%#3E0105

More saturated +25%#FF0C1E

Less saturated −25%#DD2E3B

Channel breakdown

R251

G16

B33

Red251 (98.4%)

Green16 (6.3%)

Blue33 (12.9%)

Hue355.66°

Saturation (HSL)96.71%

Lightness52.35%

Dominant channelRed

Hex per channelR FB · G 10 · B 21

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB1021 (chemical formula)

Formula
11,056.008 g/mol
1022 atoms

FB1021 has a molar mass of 11,056.008 g/mol, made up of 1022 atoms across 2 elements: 1 × F, 1021 × B.

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Molar mass

Molar mass11,056.008 g/mol

Total atoms per molecule1022

Distinct elements2

Mass of one molecule1.8358933 × 10^-20 g

Molecules per gram5.4469396 × 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

F0.2%

B99.8%

Fluorine (F)18.998 g/mol, 0.172%

Boron (B × 1021)11,037.01 g/mol, 99.828%

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