Recognised as Colour
#CB3838
- #CB3838
- Red
- Dark
- Nearest: Firebrick
#CB3838 is a red with RGB values 203, 56, 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
#CB3838#CB3838
HEX#CB3838
RGBrgb(203, 56, 56)
RGB (0–1)0.7961, 0.2196, 0.2196
RGB percentages79.6%, 22%, 22%
HSLhsl(0, 58.6%, 50.8%)
HSV / HSBhsv(0, 72.4%, 79.6%)
CMYK0%, 72.4%, 72.4%, 20.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer13,318,200
CSS custom property--colour: #CB3838;
Brightness & contrast
Relative luminance0.1581WCAG 2.x, 0 is black and 1 is white
Perceived brightness120.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.05:1
Contrast with white5.05:1WCAG normal text: AA
Contrast with black4.16:1WCAG normal text: Fail
Greyscale equivalent#575757
Inverted#34C7C7
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text5.05:1WCAG large text: AAA
Contrast with black, large text4.16:1WCAG large text: AA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#38CBCB
Analogous#CB3882, #CB8238
Triadic#38CB38, #3838CB
Split complementary#38CB82, #3882CB
Tetradic#82CB38, #38CBCB, #8238CB
Tints, shades & saturation
Channel breakdown
R203
G56
B56
Red203 (79.6%)
Green56 (22%)
Blue56 (22%)
Hue0°
Saturation (HSL)58.57%
Lightness50.78%
Dominant channelRed
Hex per channelR CB · G 38 · B 38
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Also reads as
CB3838 (chemical formula)
- Formula
- 41,500.791 g/mol
- 3839 atoms
CB3838 has a molar mass of 41,500.791 g/mol, made up of 3839 atoms across 2 elements: 1 × C, 3838 × B.
Molar mass
Molar mass41,500.791 g/mol
Total atoms per molecule3839
Distinct elements2
Mass of one molecule6.8913685 × 10^-20 g
Molecules per gram1.4510906 × 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, 0.029%
Boron (B × 3838)41,488.78 g/mol, 99.971%
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