Recognised as Colour
#FF501F
- #FF501F
- Red
- Dark
- Nearest: Orange red
#FF501F is a red with RGB values 255, 80, 31 and HSL 13°, 100%, 56%. It is a dark colour, so black text on it reaches 6.4:1 contrast (AA for normal text). The nearest named colour is Orange red.
Colour values
#FF501F#FF501F
HEX#FF501F
RGBrgb(255, 80, 31)
RGB (0–1)1, 0.3137, 0.1216
RGB percentages100%, 31.4%, 12.2%
HSLhsl(13.1, 100%, 56.1%)
HSV / HSBhsv(13.1, 87.8%, 100%)
CMYK0%, 68.6%, 87.8%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,732,191
CSS custom property--colour: #FF501F;
Brightness & contrast
Relative luminance0.27096WCAG 2.x, 0 is black and 1 is white
Perceived brightness152.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.42:1
Contrast with white3.27:1WCAG normal text: Fail
Contrast with black6.42:1WCAG normal text: AA
Greyscale equivalent#727272
Inverted#00AFE0
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.27:1WCAG large text: AA
Contrast with black, large text6.42:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#1FCEFF
Analogous#FF1F5E, #FFC01F
Triadic#1FFF50, #501FFF
Split complementary#1FFFC0, #1F5EFF
Tetradic#5EFF1F, #1FCEFF, #C01FFF
Tints, shades & saturation
Channel breakdown
R255
G80
B31
Red255 (100%)
Green80 (31.4%)
Blue31 (12.2%)
Hue13.12°
Saturation (HSL)100%
Lightness56.08%
Dominant channelRed
Hex per channelR FF · G 50 · B 1F
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Also reads as
FF501F (chemical formula)
- Formula
- 9,555.994 g/mol
- 503 atoms
FF501F has a molar mass of 9,555.994 g/mol, made up of 503 atoms across 1 element: 503 × F.
Molar mass
Molar mass9,555.994 g/mol
Total atoms per molecule503
Distinct elements1
Mass of one molecule1.5868101 × 10^-20 g
Molecules per gram6.3019512 × 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
F100%
Fluorine (F × 503)9,555.994 g/mol, 100%
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