Recognised as Colour

#FB4034

#FB4034
Red
Dark
Nearest: Tomato

#FB4034 is a red with RGB values 251, 64, 52 and HSL 4°, 96%, 59%. It is a dark colour, so black text on it reaches 5.9:1 contrast (AA for normal text). The nearest named colour is Tomato.

Colour values

#FB4034#FB4034

HEX#FB4034

RGBrgb(251, 64, 52)

RGB (0–1)0.9843, 0.251, 0.2039

RGB percentages98.4%, 25.1%, 20.4%

HSLhsl(3.6, 96.1%, 59.4%)

HSV / HSBhsv(3.6, 79.3%, 98.4%)

CMYK0%, 74.5%, 79.3%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,465,972

CSS custom property--colour: #FB4034;

Brightness & contrast

Relative luminance0.24424WCAG 2.x, 0 is black and 1 is white

Perceived brightness146.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.88:1

Contrast with white3.57:1WCAG normal text: Fail

Contrast with black5.88:1WCAG normal text: AA

Greyscale equivalent#676767

Inverted#04BFCB

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#7A6D30no red cones; affects about 1% of men; ΔE 74.4 from the original

Deuteranopia#A8962Bno green cones; the most common form, about 1% of men; ΔE 74.6 from the original

Tritanopia#FF003Fno blue cones; rare, and affects men and women equally; ΔE 15.3 from the original

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

Contrast with white, large text3.57:1WCAG large text: AA

Contrast with black, large text5.88:1WCAG large text: AAA

Named colours

Tomato · ΔE 13 Orange red · ΔE 19 Crimson · ΔE 19.1 Red · ΔE 20.7 Firebrick · ΔE 25 Coral · ΔE 26.1

Nearest named CSS colourTomato (#FF6347)ΔE 13.03, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#34EFFB

Analogous#FB348C, #FBA334

Triadic#34FB40, #4034FB

Split complementary#34FBA3, #348CFB

Tetradic#8CFB34, #34EFFB, #A334FB

Tints, shades & saturation

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

Lighter +40%#FFFCFC

Lighter +30%#FECDCA

Lighter +20%#FD9E98

Lighter +10%#FC6F66

Darker −10%#F71305

Darker −20%#C51004

Darker −30%#930C03

Darker −40%#610802

More saturated +25%#FF3C30

Less saturated −25%#E1574E

Channel breakdown

R251

G64

B52

Red251 (98.4%)

Green64 (25.1%)

Blue52 (20.4%)

Hue3.62°

Saturation (HSL)96.14%

Lightness59.41%

Dominant channelRed

Hex per channelR FB · G 40 · B 34

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB4034 (chemical formula)

Formula
43,626.538 g/mol
4035 atoms

FB4034 has a molar mass of 43,626.538 g/mol, made up of 4035 atoms across 2 elements: 1 × F, 4034 × B.

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Molar mass

Molar mass43,626.538 g/mol

Total atoms per molecule4035

Distinct elements2

Mass of one molecule7.2443571 × 10^-20 g

Molecules per gram1.3803847 × 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%

B100%

Fluorine (F)18.998 g/mol, 0.044%

Boron (B × 4034)43,607.54 g/mol, 99.956%

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