Recognised as Colour

#CB5138

#CB5138
Red
Dark
Nearest: Firebrick

#CB5138 is a red with RGB values 203, 81, 56 and HSL 10°, 59%, 51%. It is a dark colour, so black text on it reaches 4.8:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#CB5138#CB5138

HEX#CB5138

RGBrgb(203, 81, 56)

RGB (0–1)0.7961, 0.3176, 0.2196

RGB percentages79.6%, 31.8%, 22%

HSLhsl(10.2, 58.6%, 50.8%)

HSV / HSBhsv(10.2, 72.4%, 79.6%)

CMYK0%, 60.1%, 72.4%, 20.4%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer13,324,600

CSS custom property--colour: #CB5138;

Brightness & contrast

Relative luminance0.18867WCAG 2.x, 0 is black and 1 is white

Perceived brightness128.6 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 4.77:1

Contrast with white4.4:1WCAG normal text: Fail

Contrast with black4.77:1WCAG normal text: AA

Greyscale equivalent#696969

Inverted#34AEC7

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#726735no red cones; affects about 1% of men; ΔE 51.3 from the original

Deuteranopia#918234no green cones; the most common form, about 1% of men; ΔE 51.5 from the original

Tritanopia#DF354Cno blue cones; rare, and affects men and women equally; ΔE 21.1 from the original

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

Contrast with white, large text4.4:1WCAG large text: AA

Contrast with black, large text4.77:1WCAG large text: AAA

Named colours

Firebrick · ΔE 14.5 Brown · ΔE 15.8 Indian red · ΔE 17.3 Tomato · ΔE 17.5 Coral · ΔE 18.8 Sienna · ΔE 19.3

Nearest named CSS colourFirebrick (#B22222)ΔE 14.53, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#38B2CB

Analogous#CB3868, #CB9B38

Triadic#38CB51, #5138CB

Split complementary#38CB9A, #3869CB

Tetradic#68CB38, #38B2CB, #9A38CB

Tints, shades & saturation

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

Lighter +40%#F5DEDA

Lighter +30%#EBBBB1

Lighter +20%#E09889

Lighter +10%#D67460

Darker −10%#A5402B

Darker −20%#7C3021

Darker −30%#542116

Darker −40%#2C110B

More saturated +25%#EA3C19

Less saturated −25%#AC6657

Channel breakdown

R203

G81

B56

Red203 (79.6%)

Green81 (31.8%)

Blue56 (22%)

Hue10.2°

Saturation (HSL)58.57%

Lightness50.78%

Dominant channelRed

Hex per channelR CB · G 51 · B 38

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Harmonies

Lighter and darker

Similar named colours

Also reads as

CB5138 (chemical formula)

Formula
55,553.791 g/mol
5139 atoms

CB5138 has a molar mass of 55,553.791 g/mol, made up of 5139 atoms across 2 elements: 1 × C, 5138 × B.

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Molar mass

Molar mass55,553.791 g/mol

Total atoms per molecule5139

Distinct elements2

Mass of one molecule9.224924 × 10^-20 g

Molecules per gram1.0840198 × 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, 0.022%

Boron (B × 5138)55,541.78 g/mol, 99.978%

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