Recognised as Colour

#C21C1C

#C21C1C
Red
Dark
Nearest: Firebrick

#C21C1C is a red with RGB values 194, 28, 28 and HSL 0°, 75%, 44%. It is a dark colour, so white text on it reaches 6:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#C21C1C#C21C1C

HEX#C21C1C

RGBrgb(194, 28, 28)

RGB (0–1)0.7608, 0.1098, 0.1098

RGB percentages76.1%, 11%, 11%

HSLhsl(0, 74.8%, 43.5%)

HSV / HSBhsv(0, 85.6%, 76.1%)

CMYK0%, 85.6%, 85.6%, 23.9%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,721,180

CSS custom property--colour: #C21C1C;

Brightness & contrast

Relative luminance0.12384WCAG 2.x, 0 is black and 1 is white

Perceived brightness108.6 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.04:1

Contrast with white6.04:1WCAG normal text: AA

Contrast with black3.48:1WCAG normal text: Fail

Greyscale equivalent#3F3F3F

Inverted#3DE3E3

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#564C19no red cones; affects about 1% of men; ΔE 66.6 from the original

Deuteranopia#7D6F10no green cones; the most common form, about 1% of men; ΔE 66.7 from the original

Tritanopia#D60020no blue cones; rare, and affects men and women equally; ΔE 9.5 from the original

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

Contrast with white, large text6.04:1WCAG large text: AAA

Contrast with black, large text3.48:1WCAG large text: AA

Named colours

Firebrick · ΔE 9.4 Crimson · ΔE 15.2 Dark red · ΔE 17.8 Brown · ΔE 19 Tomato · ΔE 20.8 Maroon · ΔE 22.3

Nearest named CSS colourFirebrick (#B22222)ΔE 9.43, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#1CC2C2

Analogous#C21C6F, #C26F1C

Triadic#1CC21C, #1C1CC2

Split complementary#1CC26F, #1C6FC2

Tetradic#6FC21C, #1CC2C2, #6F1CC2

Tints, shades & saturation

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

Lighter +40%#F4B6B6

Lighter +30%#EE8989

Lighter +20%#E85C5C

Lighter +10%#E13030

Darker −10%#951616

Darker −20%#690F0F

Darker −30%#3C0909

Darker −40%#100202

More saturated +25%#DE0000

Less saturated −25%#A63838

Channel breakdown

R194

G28

B28

Red194 (76.1%)

Green28 (11%)

Blue28 (11%)

Hue0°

Saturation (HSL)74.77%

Lightness43.53%

Dominant channelRed

Hex per channelR C2 · G 1C · B 1C

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Harmonies

Lighter and darker

Similar named colours

Also reads as

C21C1C (chemical formula)

Formula
276.253 g/mol
23 atoms

C21C1C has a molar mass of 276.253 g/mol, made up of 23 atoms across 1 element: 23 × C.

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Molar mass

Molar mass276.253 g/mol

Total atoms per molecule23

Distinct elements1

Mass of one molecule4.587289 × 10^-22 g

Molecules per gram2.1799368 × 10^21

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 × 23)276.253 g/mol, 100%

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Elements in this formula

Carbon

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