Recognised as Colour

#C42B15

#C42B15
Red
Dark
Nearest: Firebrick

#C42B15 is a red with RGB values 196, 43, 21 and HSL 8°, 81%, 43%. It is a dark colour, so white text on it reaches 5.7:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#C42B15#C42B15

HEX#C42B15

RGBrgb(196, 43, 21)

RGB (0–1)0.7686, 0.1686, 0.0824

RGB percentages76.9%, 16.9%, 8.2%

HSLhsl(7.5, 80.6%, 42.5%)

HSV / HSBhsv(7.5, 89.3%, 76.9%)

CMYK0%, 78.1%, 89.3%, 23.1%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,856,085

CSS custom property--colour: #C42B15;

Brightness & contrast

Relative luminance0.13518WCAG 2.x, 0 is black and 1 is white

Perceived brightness112.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 5.67:1

Contrast with white5.67:1WCAG normal text: AA

Contrast with black3.7:1WCAG normal text: Fail

Greyscale equivalent#4A4A4A

Inverted#3BD4EA

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#5C510Fno red cones; affects about 1% of men; ΔE 63.4 from the original

Deuteranopia#827306no green cones; the most common form, about 1% of men; ΔE 63.3 from the original

Tritanopia#D80028no blue cones; rare, and affects men and women equally; ΔE 14.4 from the original

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

Contrast with white, large text5.67:1WCAG large text: AAA

Contrast with black, large text3.7:1WCAG large text: AA

Named colours

Firebrick · ΔE 12.7 Tomato · ΔE 18.9 Dark red · ΔE 18.9 Crimson · ΔE 20.4 Brown · ΔE 21.5 Maroon · ΔE 23.6

Nearest named CSS colourFirebrick (#B22222)ΔE 12.69, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#15AEC4

Analogous#C41557, #C48315

Triadic#15C42B, #2B15C4

Split complementary#15C483, #1556C4

Tetradic#57C415, #15AEC4, #8315C4

Tints, shades & saturation

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

Lighter +40%#F6B8AF

Lighter +30%#F18F81

Lighter +20%#ED6652

Lighter +10%#E83D24

Darker −10%#962110

Darker −20%#68170B

Darker −30%#3A0D06

Darker −40%#0C0301

More saturated +25%#D91B00

Less saturated −25%#A93F30

Channel breakdown

R196

G43

B21

Red196 (76.9%)

Green43 (16.9%)

Blue21 (8.2%)

Hue7.54°

Saturation (HSL)80.65%

Lightness42.55%

Dominant channelRed

Hex per channelR C4 · G 2B · B 15

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Harmonies

Lighter and darker

Similar named colours

Also reads as

C42B15 (chemical formula)

Formula
666.612 g/mol
57 atoms

C42B15 has a molar mass of 666.612 g/mol, made up of 57 atoms across 2 elements: 42 × C, 15 × B.

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Molar mass

Molar mass666.612 g/mol

Total atoms per molecule57

Distinct elements2

Mass of one molecule1.1069353 × 10^-21 g

Molecules per gram9.0339519 × 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

C75.7%

B24.3%

Carbon (C × 42)504.462 g/mol, 75.676%

Boron (B × 15)162.15 g/mol, 24.324%

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