Recognised as Colour

#C50000

#C50000
Red
Dark
Nearest: Firebrick

#C50000 is a red with RGB values 197, 0, 0 and HSL 0°, 100%, 39%. It is a dark colour, so white text on it reaches 6.2:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#C50000#C50000

HEX#C50000

RGBrgb(197, 0, 0)

RGB (0–1)0.7725, 0, 0

RGB percentages77.3%, 0%, 0%

HSLhsl(0, 100%, 38.6%)

HSV / HSBhsv(0, 100%, 77.3%)

CMYK0%, 100%, 100%, 22.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,910,592

CSS custom property--colour: #C50000;

Brightness & contrast

Relative luminance0.1187WCAG 2.x, 0 is black and 1 is white

Perceived brightness107.7 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.22:1

Contrast with white6.22:1WCAG normal text: AA

Contrast with black3.37:1WCAG normal text: Fail

Greyscale equivalent#2A2A2A

Inverted#3AFFFF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#524800no red cones; affects about 1% of men; ΔE 72.1 from the original

Deuteranopia#7D6E00no green cones; the most common form, about 1% of men; ΔE 70.6 from the original

Tritanopia#DA0009no blue cones; rare, and affects men and women equally; ΔE 7.1 from the original

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

Contrast with white, large text6.22:1WCAG large text: AAA

Contrast with black, large text3.37:1WCAG large text: AA

Named colours

Firebrick · ΔE 20.4 Orange red · ΔE 21.5 Red · ΔE 22.1 Crimson · ΔE 23.1 Dark red · ΔE 24.2 Tomato · ΔE 24.4

Nearest named CSS colourFirebrick (#B22222)ΔE 20.43, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00C5C5

Analogous#C50063, #C56300

Triadic#00C500, #0000C5

Split complementary#00C563, #0063C5

Tetradic#63C500, #00C5C5, #6300C5

Tints, shades & saturation

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

Lighter +40%#FF9292

Lighter +30%#FF5F5F

Lighter +20%#FF2C2C

Lighter +10%#F80000

Darker −10%#920000

Darker −20%#5F0000

Darker −30%#2C0000

Darker −40%#000000

More saturated +25%#C50000

Less saturated −25%#AC1919

Channel breakdown

R197

Red197 (77.3%)

Green0 (0%)

Blue0 (0%)

Hue0°

Saturation (HSL)100%

Lightness38.63%

Dominant channelRed

Hex per channelR C5 · G 00 · B 00

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Harmonies

Lighter and darker

Similar named colours

Also reads as

C50000 (chemical formula)

Formula
600,550 g/mol
50000 atoms

C50000 has a molar mass of 600,550 g/mol, made up of 50000 atoms across 1 element: 50000 × C.

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Molar mass

Molar mass600,550 g/mol

Total atoms per molecule50000

Distinct elements1

Mass of one molecule9.9723674 × 10^-19 g

Molecules per gram1.0027709 × 10^18

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

C100%

Carbon (C × 50000)600,550 g/mol, 100%

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Elements in this formula

Carbon

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