Recognised as Colour

#C91503

#C91503
Red
Dark
Nearest: Firebrick

#C91503 is a red with RGB values 201, 21, 3 and HSL 5°, 97%, 40%. It is a dark colour, so white text on it reaches 5.8:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#C91503#C91503

HEX#C91503

RGBrgb(201, 21, 3)

RGB (0–1)0.7882, 0.0824, 0.0118

RGB percentages78.8%, 8.2%, 1.2%

HSLhsl(5.5, 97.1%, 40%)

HSV / HSBhsv(5.5, 98.5%, 78.8%)

CMYK0%, 89.6%, 98.5%, 21.2%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer13,178,115

CSS custom property--colour: #C91503;

Brightness & contrast

Relative luminance0.1296WCAG 2.x, 0 is black and 1 is white

Perceived brightness111.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 5.85:1

Contrast with white5.85:1WCAG normal text: AA

Contrast with black3.59:1WCAG normal text: Fail

Greyscale equivalent#3A3A3A

Inverted#36EAFC

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#584C00no red cones; affects about 1% of men; ΔE 69.8 from the original

Deuteranopia#817200no green cones; the most common form, about 1% of men; ΔE 69.5 from the original

Tritanopia#DE0016no blue cones; rare, and affects men and women equally; ΔE 8.8 from the original

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

Contrast with white, large text5.85:1WCAG large text: AAA

Contrast with black, large text3.59:1WCAG large text: AA

Named colours

Firebrick · ΔE 20.1 Orange red · ΔE 20.3 Red · ΔE 22.1 Tomato · ΔE 22.5 Crimson · ΔE 23.2 Dark red · ΔE 24.5

Nearest named CSS colourFirebrick (#B22222)ΔE 20.13, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#03B7C9

Analogous#C90354, #C97803

Triadic#03C915, #1503C9

Split complementary#03C978, #0354C9

Tetradic#54C903, #03B7C9, #7803C9

Tints, shades & saturation

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

Lighter +40%#FEA39B

Lighter +30%#FD7668

Lighter +20%#FC4836

Lighter +10%#FB1A04

Darker −10%#971002

Darker −20%#650A02

Darker −30%#320501

Darker −40%#000000

More saturated +25%#CC1300

Less saturated −25%#B02A1C

Channel breakdown

R201

G21

Red201 (78.8%)

Green21 (8.2%)

Blue3 (1.2%)

Hue5.45°

Saturation (HSL)97.06%

Lightness40%

Dominant channelRed

Hex per channelR C9 · G 15 · B 03

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Harmonies

Lighter and darker

Similar named colours

Also reads as

C91503 (chemical formula)

Formula
1,099,042.533 g/mol
91503 atoms

C91503 has a molar mass of 1,099,042.533 g/mol, made up of 91503 atoms across 1 element: 91503 × C.

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Molar mass

Molar mass1,099,042.533 g/mol

Total atoms per molecule91503

Distinct elements1

Mass of one molecule1.8250031 × 10^-18 g

Molecules per gram5.4794429 × 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 × 91503)1,099,042.533 g/mol, 100%

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Elements in this formula

Carbon

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