Recognised as Colour
#CB3938
- #CB3938
- Red
- Dark
- Nearest: Firebrick
#CB3938 is a red with RGB values 203, 57, 56 and HSL 0°, 59%, 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
#CB3938#CB3938
HEX#CB3938
RGBrgb(203, 57, 56)
RGB (0–1)0.7961, 0.2235, 0.2196
RGB percentages79.6%, 22.4%, 22%
HSLhsl(0.4, 58.6%, 50.8%)
HSV / HSBhsv(0.4, 72.4%, 79.6%)
CMYK0%, 71.9%, 72.4%, 20.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer13,318,456
CSS custom property--colour: #CB3938;
Brightness & contrast
Relative luminance0.15908WCAG 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#34C6C7
Colour vision & accessibility
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
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#38CACB
Analogous#CB3880, #CB8338
Triadic#38CB39, #3938CB
Split complementary#38CB83, #3880CB
Tetradic#80CB38, #38CACB, #8338CB
Tints, shades & saturation
Channel breakdown
R203
G57
B56
Red203 (79.6%)
Green57 (22.4%)
Blue56 (22%)
Hue0.41°
Saturation (HSL)58.57%
Lightness50.78%
Dominant channelRed
Hex per channelR CB · G 39 · B 38
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Also reads as
CB3938 (chemical formula)
- Formula
- 42,581.791 g/mol
- 3939 atoms
CB3938 has a molar mass of 42,581.791 g/mol, made up of 3939 atoms across 2 elements: 1 × C, 3938 × B.
Molar mass
Molar mass42,581.791 g/mol
Total atoms per molecule3939
Distinct elements2
Mass of one molecule7.0708728 × 10^-20 g
Molecules per gram1.4142526 × 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 × 3938)42,569.78 g/mol, 99.972%
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