Recognised as Colour

#C31F25

#C31F25
Red
Dark
Nearest: Firebrick

#C31F25 is a red with RGB values 195, 31, 37 and HSL 358°, 73%, 44%. It is a dark colour, so white text on it reaches 5.9:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#C31F25#C31F25

HEX#C31F25

RGBrgb(195, 31, 37)

RGB (0–1)0.7647, 0.1216, 0.1451

RGB percentages76.5%, 12.2%, 14.5%

HSLhsl(357.8, 72.6%, 44.3%)

HSV / HSBhsv(357.8, 84.1%, 76.5%)

CMYK0%, 84.1%, 81%, 23.5%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,787,493

CSS custom property--colour: #C31F25;

Brightness & contrast

Relative luminance0.12716WCAG 2.x, 0 is black and 1 is white

Perceived brightness110 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 5.93:1

Contrast with white5.93:1WCAG normal text: AA

Contrast with black3.54:1WCAG normal text: Fail

Greyscale equivalent#424242

Inverted#3CE0DA

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#564D23no red cones; affects about 1% of men; ΔE 66.4 from the original

Deuteranopia#7E701Dno green cones; the most common form, about 1% of men; ΔE 66.1 from the original

Tritanopia#D70024no blue cones; rare, and affects men and women equally; ΔE 10.7 from the original

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

Contrast with white, large text5.93:1WCAG large text: AAA

Contrast with black, large text3.54:1WCAG large text: AA

Named colours

Firebrick · ΔE 7.1 Crimson · ΔE 12.4 Brown · ΔE 16.2 Dark red · ΔE 17.8 Tomato · ΔE 21.1 Maroon · ΔE 21.7

Nearest named CSS colourFirebrick (#B22222)ΔE 7.08, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#1FC3BD

Analogous#C31F77, #C36B1F

Triadic#25C31F, #1F25C3

Split complementary#1FC36B, #1F77C3

Tetradic#77C31F, #1FC3BD, #6B1FC3

Tints, shades & saturation

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

Lighter +40%#F4BABC

Lighter +30%#ED8E91

Lighter +20%#E66267

Lighter +10%#DF363C

Darker −10%#97181D

Darker −20%#6B1114

Darker −30%#3F0A0C

Darker −40%#130304

More saturated +25%#DF030B

Less saturated −25%#A73B3F

Channel breakdown

R195

G31

B37

Red195 (76.5%)

Green31 (12.2%)

Blue37 (14.5%)

Hue357.8°

Saturation (HSL)72.57%

Lightness44.31%

Dominant channelRed

Hex per channelR C3 · G 1F · B 25

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Harmonies

Lighter and darker

Similar named colours

Also reads as

C31F25 (chemical formula)

Formula
847.291 g/mol
56 atoms

C31F25 has a molar mass of 847.291 g/mol, made up of 56 atoms across 2 elements: 31 × C, 25 × F.

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Molar mass

Molar mass847.291 g/mol

Total atoms per molecule56

Distinct elements2

Mass of one molecule1.4069598 × 10^-21 g

Molecules per gram7.1075236 × 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

C43.9%

F56.1%

Carbon (C × 31)372.341 g/mol, 43.945%

Fluorine (F × 25)474.95 g/mol, 56.055%

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