Recognised as Colour

#FC180B

#FC180B
Red
Dark
Nearest: Red

#FC180B is a red with RGB values 252, 24, 11 and HSL 3°, 98%, 52%. It is a dark colour, so black text on it reaches 5.3:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FC180B#FC180B

HEX#FC180B

RGBrgb(252, 24, 11)

RGB (0–1)0.9882, 0.0941, 0.0431

RGB percentages98.8%, 9.4%, 4.3%

HSLhsl(3.2, 97.6%, 51.6%)

HSV / HSBhsv(3.2, 95.6%, 98.8%)

CMYK0%, 90.5%, 95.6%, 1.2%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,521,227

CSS custom property--colour: #FC180B;

Brightness & contrast

Relative luminance0.21373WCAG 2.x, 0 is black and 1 is white

Perceived brightness139.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.27:1

Contrast with white3.98:1WCAG normal text: Fail

Contrast with black5.27:1WCAG normal text: AA

Greyscale equivalent#484848

Inverted#03E7F4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6E6100no red cones; affects about 1% of men; ΔE 84.1 from the original

Deuteranopia#A39000no green cones; the most common form, about 1% of men; ΔE 83 from the original

Tritanopia#FF001Cno blue cones; rare, and affects men and women equally; ΔE 6.1 from the original

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

Contrast with white, large text3.98:1WCAG large text: AA

Contrast with black, large text5.27:1WCAG large text: AAA

Named colours

Red · ΔE 4 Orange red · ΔE 11.5 Tomato · ΔE 27.9 Crimson · ΔE 31.9 Firebrick · ΔE 37 Coral · ΔE 38.7

Nearest named CSS colourRed (#FF0000)ΔE 4.02, a close match

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#0BEFFC

Analogous#FC0B77, #FC910B

Triadic#0BFC18, #180BFC

Split complementary#0BFC91, #0B76FC

Tetradic#76FC0B, #0BEFFC, #910BFC

Tints, shades & saturation

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

Lighter +40%#FED7D5

Lighter +30%#FEA7A2

Lighter +20%#FD7770

Lighter +10%#FD483D

Darker −10%#D10E03

Darker −20%#9F0A02

Darker −30%#6D0701

Darker −40%#3A0401

More saturated +25%#FF1508

Less saturated −25%#DD342A

Channel breakdown

R252

G24

B11

Red252 (98.8%)

Green24 (9.4%)

Blue11 (4.3%)

Hue3.24°

Saturation (HSL)97.57%

Lightness51.57%

Dominant channelRed

Hex per channelR FC · G 18 · B 0B

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FC180B (chemical formula)

Formula
2,191.788 g/mol
182 atoms

FC180B has a molar mass of 2,191.788 g/mol, made up of 182 atoms across 3 elements: 1 × F, 180 × C, 1 × B.

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Molar mass

Molar mass2,191.788 g/mol

Total atoms per molecule182

Distinct elements3

Mass of one molecule3.6395496 × 10^-21 g

Molecules per gram2.7475927 × 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

F0.9%

C98.6%

B0.5%

Fluorine (F)18.998 g/mol, 0.867%

Carbon (C × 180)2,161.98 g/mol, 98.64%

Boron (B)10.81 g/mol, 0.493%

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