Recognised as Colour
#FEFF37
- #FEFF37
- Yellow
- Light
- Nearest: Yellow
#FEFF37 is a yellow with RGB values 254, 255, 55 and HSL 60°, 100%, 61%. It is a light colour, so black text on it reaches 19.6:1 contrast (AAA for normal text). The nearest named colour is Yellow.
Colour values
#FEFF37#FEFF37
HEX#FEFF37
RGBrgb(254, 255, 55)
RGB (0–1)0.9961, 1, 0.2157
RGB percentages99.6%, 100%, 21.6%
HSLhsl(60.3, 100%, 60.8%)
HSV / HSBhsv(60.3, 78.4%, 100%)
CMYK0.4%, 0%, 78.4%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,711,479
CSS custom property--colour: #FEFF37;
Brightness & contrast
Relative luminance0.92867WCAG 2.x, 0 is black and 1 is white
Perceived brightness240.4 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 19.57:1
Contrast with white1.07:1WCAG normal text: Fail
Contrast with black19.57:1WCAG normal text: AAA
Greyscale equivalent#F0F0F0
Inverted#0100C8
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text1.07:1WCAG large text: Fail
Contrast with black, large text19.57:1WCAG large text: AAA
Named colours
Hue familyyellow
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#3837FF
Analogous#FF9C37, #9AFF37
Triadic#37FEFF, #FF37FE
Split complementary#379AFF, #9C37FF
Tetradic#37FF9C, #3837FF, #FF379A
Tints, shades & saturation
Channel breakdown
R254
G255
B55
Red254 (99.6%)
Green255 (100%)
Blue55 (21.6%)
Hue60.3°
Saturation (HSL)100%
Lightness60.78%
Dominant channelGreen
Hex per channelR FE · G FF · B 37
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Harmonies
Similar named colours
Also reads as
FeFF37 (chemical formula)
- Formula
- 777.769 g/mol
- 39 atoms
FeFF37 has a molar mass of 777.769 g/mol, made up of 39 atoms across 2 elements: 1 × Fe, 38 × F.
Molar mass
Molar mass777.769 g/mol
Total atoms per molecule39
Distinct elements2
Mass of one molecule1.2915158 × 10^-21 g
Molecules per gram7.7428398 × 10^20
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
Fe7.2%
F92.8%
Iron (Fe)55.845 g/mol, 7.18%
Fluorine (F × 38)721.924 g/mol, 92.82%
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