Recognised as Colour

#FB180C

#FB180C
Red
Dark
Nearest: Red

#FB180C is a red with RGB values 251, 24, 12 and HSL 3°, 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

#FB180C#FB180C

HEX#FB180C

RGBrgb(251, 24, 12)

RGB (0–1)0.9843, 0.0941, 0.0471

RGB percentages98.4%, 9.4%, 4.7%

HSLhsl(3, 96.8%, 51.6%)

HSV / HSBhsv(3, 95.2%, 98.4%)

CMYK0%, 90.4%, 95.2%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,455,692

CSS custom property--colour: #FB180C;

Brightness & contrast

Relative luminance0.21189WCAG 2.x, 0 is black and 1 is white

Perceived brightness138.5 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.24:1

Contrast with white4.01:1WCAG normal text: Fail

Contrast with black5.24:1WCAG normal text: AA

Greyscale equivalent#474747

Inverted#04E7F3

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6E6000no red cones; affects about 1% of men; ΔE 83.3 from the original

Deuteranopia#A28F00no green cones; the most common form, about 1% of men; ΔE 82.7 from the original

Tritanopia#FF001Dno blue cones; rare, and affects men and women equally; ΔE 6.2 from the original

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

Contrast with white, large text4.01:1WCAG large text: AA

Contrast with black, large text5.24:1WCAG large text: AAA

Named colours

Red · ΔE 4.5 Orange red · ΔE 11.6 Tomato · ΔE 27.5 Crimson · ΔE 31.4 Firebrick · ΔE 36.5 Coral · ΔE 38.4

Nearest named CSS colourRed (#FF0000)ΔE 4.52, a close match

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#0CEFFB

Analogous#FB0C77, #FB900C

Triadic#0CFB18, #180CFB

Split complementary#0CFB90, #0C77FB

Tetradic#77FB0C, #0CEFFB, #900CFB

Tints, shades & saturation

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

Lighter +40%#FED7D5

Lighter +30%#FDA7A3

Lighter +20%#FD7770

Lighter +10%#FC483E

Darker −10%#D10E03

Darker −20%#9E0A03

Darker −30%#6C0702

Darker −40%#3A0401

More saturated +25%#FF1408

Less saturated −25%#DC342B

Channel breakdown

R251

G24

B12

Red251 (98.4%)

Green24 (9.4%)

Blue12 (4.7%)

Hue3.01°

Saturation (HSL)96.76%

Lightness51.57%

Dominant channelRed

Hex per channelR FB · G 18 · B 0C

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB180C (chemical formula)

Formula
1,976.809 g/mol
182 atoms

FB180C has a molar mass of 1,976.809 g/mol, made up of 182 atoms across 3 elements: 1 × F, 180 × B, 1 × C.

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Molar mass

Molar mass1,976.809 g/mol

Total atoms per molecule182

Distinct elements3

Mass of one molecule3.2825686 × 10^-21 g

Molecules per gram3.0463949 × 10^20

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

F1%

B98.4%

C0.6%

Fluorine (F)18.998 g/mol, 0.961%

Boron (B × 180)1,945.8 g/mol, 98.431%

Carbon (C)12.011 g/mol, 0.608%

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