Recognised as Colour

#C55151

#C55151
Red
Dark
Nearest: Indian red

#C55151 is a red with RGB values 197, 81, 81 and HSL 0°, 50%, 55%. It is a dark colour, so black text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Indian red.

Colour values

#C55151#C55151

HEX#C55151

RGBrgb(197, 81, 81)

RGB (0–1)0.7725, 0.3176, 0.3176

RGB percentages77.3%, 31.8%, 31.8%

HSLhsl(0, 50%, 54.5%)

HSV / HSBhsv(0, 58.9%, 77.3%)

CMYK0%, 58.9%, 58.9%, 22.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,931,409

CSS custom property--colour: #C55151;

Brightness & contrast

Relative luminance0.18349WCAG 2.x, 0 is black and 1 is white

Perceived brightness127.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 4.67:1

Contrast with white4.5:1WCAG normal text: Fail

Contrast with black4.67:1WCAG normal text: AA

Greyscale equivalent#6A6A6A

Inverted#3AAEAE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6E6750no red cones; affects about 1% of men; ΔE 49.1 from the original

Deuteranopia#8B804Eno green cones; the most common form, about 1% of men; ΔE 50.1 from the original

Tritanopia#D73C52no blue cones; rare, and affects men and women equally; ΔE 14.6 from the original

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

Contrast with white, large text4.5:1WCAG large text: AA

Contrast with black, large text4.67:1WCAG large text: AAA

Named colours

Indian red · ΔE 4.2 Brown · ΔE 14.5 Light coral · ΔE 17.2 Salmon · ΔE 18.2 Firebrick · ΔE 20 Sienna · ΔE 21.7

Nearest named CSS colourIndian red (#CD5C5C)ΔE 4.15, a close match

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#51C5C5

Analogous#C5518B, #C58B51

Triadic#51C551, #5151C5

Split complementary#51C58B, #518BC5

Tetradic#8BC551, #51C5C5, #8B51C5

Tints, shades & saturation

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

Lighter +40%#F8EAEA

Lighter +30%#EBC4C4

Lighter +20%#DF9E9E

Lighter +10%#D27777

Darker −10%#AA3939

Darker −20%#842C2C

Darker −30%#5E1F1F

Darker −40%#381313

More saturated +25%#E23434

Less saturated −25%#A86E6E

Channel breakdown

R197

G81

B81

Red197 (77.3%)

Green81 (31.8%)

Blue81 (31.8%)

Hue0°

Saturation (HSL)50%

Lightness54.51%

Dominant channelRed

Hex per channelR C5 · G 51 · B 51

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Harmonies

Lighter and darker

Similar named colours

Also reads as

C55151 (chemical formula)

Formula
662,418.661 g/mol
55151 atoms

C55151 has a molar mass of 662,418.661 g/mol, made up of 55151 atoms across 1 element: 55151 × C.

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Molar mass

Molar mass662,418.661 g/mol

Total atoms per molecule55151

Distinct elements1

Mass of one molecule1.0999721 × 10^-18 g

Molecules per gram9.09114 × 10^17

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 × 55151)662,418.661 g/mol, 100%

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Elements in this formula

Carbon

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