Recognised as Colour

#CB3939

#CB3939
Red
Dark
Nearest: Firebrick

#CB3939 is a red with RGB values 203, 57, 57 and HSL 0°, 58%, 51%. It is a dark colour, so white text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#CB3939#CB3939

HEX#CB3939

RGBrgb(203, 57, 57)

RGB (0–1)0.7961, 0.2235, 0.2235

RGB percentages79.6%, 22.4%, 22.4%

HSLhsl(0, 58.4%, 51%)

HSV / HSBhsv(0, 71.9%, 79.6%)

CMYK0%, 71.9%, 71.9%, 20.4%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer13,318,457

CSS custom property--colour: #CB3939;

Brightness & contrast

Relative luminance0.15918WCAG 2.x, 0 is black and 1 is white

Perceived brightness120.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 5.02:1

Contrast with white5.02:1WCAG normal text: AA

Contrast with black4.18:1WCAG normal text: Fail

Greyscale equivalent#585858

Inverted#34C6C6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#635B37no red cones; affects about 1% of men; ΔE 61.4 from the original

Deuteranopia#887B34no green cones; the most common form, about 1% of men; ΔE 61.7 from the original

Tritanopia#DF003Bno blue cones; rare, and affects men and women equally; ΔE 16.5 from the original

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

Contrast with white, large text5.02:1WCAG large text: AAA

Contrast with black, large text4.18:1WCAG large text: AA

Named colours

Firebrick · ΔE 8.5 Brown · ΔE 12.5 Crimson · ΔE 13.9 Indian red · ΔE 18.4 Tomato · ΔE 19.5 Dark red · ΔE 20.9

Nearest named CSS colourFirebrick (#B22222)ΔE 8.5, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#39CBCB

Analogous#CB3982, #CB8239

Triadic#39CB39, #3939CB

Split complementary#39CB82, #3982CB

Tetradic#82CB39, #39CBCB, #8239CB

Tints, shades & saturation

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

Lighter +40%#F5DBDB

Lighter +30%#EBB2B2

Lighter +20%#E08A8A

Lighter +10%#D66161

Darker −10%#A62B2B

Darker −20%#7D2121

Darker −30%#551616

Darker −40%#2C0C0C

More saturated +25%#EA1A1A

Less saturated −25%#AC5858

Channel breakdown

R203

G57

B57

Red203 (79.6%)

Green57 (22.4%)

Blue57 (22.4%)

Hue0°

Saturation (HSL)58.4%

Lightness50.98%

Dominant channelRed

Hex per channelR CB · G 39 · B 39

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Harmonies

Lighter and darker

Similar named colours

Also reads as

CB3939 (chemical formula)

Formula
42,592.601 g/mol
3940 atoms

CB3939 has a molar mass of 42,592.601 g/mol, made up of 3940 atoms across 2 elements: 1 × C, 3939 × B.

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Molar mass

Molar mass42,592.601 g/mol

Total atoms per molecule3940

Distinct elements2

Mass of one molecule7.0726678 × 10^-20 g

Molecules per gram1.4138936 × 10^19

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

C0%

B100%

Carbon (C)12.011 g/mol, 0.028%

Boron (B × 3939)42,580.59 g/mol, 99.972%

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