Recognised as Colour
#CF4037
- #CF4037
- Red
- Dark
- Nearest: Firebrick
#CF4037 is a red with RGB values 207, 64, 55 and HSL 4°, 61%, 51%. It is a dark colour, so white text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Firebrick.
Colour values
#CF4037#CF4037
HEX#CF4037
RGBrgb(207, 64, 55)
RGB (0–1)0.8118, 0.251, 0.2157
RGB percentages81.2%, 25.1%, 21.6%
HSLhsl(3.6, 61.3%, 51.4%)
HSV / HSBhsv(3.6, 73.4%, 81.2%)
CMYK0%, 69.1%, 73.4%, 18.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer13,582,391
CSS custom property--colour: #CF4037;
Brightness & contrast
Relative luminance0.17208WCAG 2.x, 0 is black and 1 is white
Perceived brightness124.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.73:1
Contrast with white4.73:1WCAG normal text: AA
Contrast with black4.44:1WCAG normal text: Fail
Greyscale equivalent#5E5E5E
Inverted#30BFC8
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.73:1WCAG large text: AAA
Contrast with black, large text4.44:1WCAG large text: AA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#37C6CF
Analogous#CF377A, #CF8C37
Triadic#37CF40, #4037CF
Split complementary#37CF8C, #377ACF
Tetradic#7ACF37, #37C6CF, #8C37CF
Tints, shades & saturation
Channel breakdown
R207
G64
B55
Red207 (81.2%)
Green64 (25.1%)
Blue55 (21.6%)
Hue3.55°
Saturation (HSL)61.29%
Lightness51.37%
Dominant channelRed
Hex per channelR CF · G 40 · B 37
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Also reads as
CF4037 (chemical formula)
- Formula
- 76,706.937 g/mol
- 4038 atoms
CF4037 has a molar mass of 76,706.937 g/mol, made up of 4038 atoms across 2 elements: 1 × C, 4037 × F.
Molar mass
Molar mass76,706.937 g/mol
Total atoms per molecule4038
Distinct elements2
Mass of one molecule1.2737487 × 10^-19 g
Molecules per gram7.8508424 × 10^18
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%
F100%
Carbon (C)12.011 g/mol, 0.016%
Fluorine (F × 4037)76,694.926 g/mol, 99.984%
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