Recognised as Colour

#FB3508

#FB3508
Red
Dark
Nearest: Orange red

#FB3508 is a red with RGB values 251, 53, 8 and HSL 11°, 97%, 51%. It is a dark colour, so black text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#FB3508#FB3508

HEX#FB3508

RGBrgb(251, 53, 8)

RGB (0–1)0.9843, 0.2078, 0.0314

RGB percentages98.4%, 20.8%, 3.1%

HSLhsl(11.1, 96.8%, 50.8%)

HSV / HSBhsv(11.1, 96.8%, 98.4%)

CMYK0%, 78.9%, 96.8%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,463,112

CSS custom property--colour: #FB3508;

Brightness & contrast

Relative luminance0.23073WCAG 2.x, 0 is black and 1 is white

Perceived brightness143.2 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.61:1

Contrast with white3.74:1WCAG normal text: Fail

Contrast with black5.61:1WCAG normal text: AA

Greyscale equivalent#5C5C5C

Inverted#04CAF7

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#776800no red cones; affects about 1% of men; ΔE 77.6 from the original

Deuteranopia#A79400no green cones; the most common form, about 1% of men; ΔE 77.4 from the original

Tritanopia#FF0030no blue cones; rare, and affects men and women equally; ΔE 18.8 from the original

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

Contrast with white, large text3.74:1WCAG large text: AA

Contrast with black, large text5.61:1WCAG large text: AAA

Named colours

Orange red · ΔE 5.5 Red · ΔE 9 Tomato · ΔE 24.6 Crimson · ΔE 33.1 Coral · ΔE 34 Chocolate · ΔE 35.5

Nearest named CSS colourOrange red (#FF4500)ΔE 5.46, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#08CEFB

Analogous#FB0855, #FBAE08

Triadic#08FB35, #3508FB

Split complementary#08FBAE, #0855FB

Tetradic#55FB08, #08CEFB, #AE08FB

Tints, shades & saturation

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

Lighter +40%#FED9D1

Lighter +30%#FDB09F

Lighter +20%#FD876C

Lighter +10%#FC5E3A

Darker −10%#CD2903

Darker −20%#9A1F03

Darker −30%#681502

Darker −40%#360B01

More saturated +25%#FF3204

Less saturated −25%#DC4927

Channel breakdown

R251

G53

Red251 (98.4%)

Green53 (20.8%)

Blue8 (3.1%)

Hue11.11°

Saturation (HSL)96.81%

Lightness50.78%

Dominant channelRed

Hex per channelR FB · G 35 · B 08

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB3508 (chemical formula)

Formula
37,940.478 g/mol
3509 atoms

FB3508 has a molar mass of 37,940.478 g/mol, made up of 3509 atoms across 2 elements: 1 × F, 3508 × B.

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Molar mass

Molar mass37,940.478 g/mol

Total atoms per molecule3509

Distinct elements2

Mass of one molecule6.3001646 × 10^-20 g

Molecules per gram1.5872601 × 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, 0.05%

Boron (B × 3508)37,921.48 g/mol, 99.95%

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Elements in this formula

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