Recognised as Colour

#F83537

#F83537
Red
Dark
Nearest: Crimson

#F83537 is a red with RGB values 248, 53, 55 and HSL 359°, 93%, 59%. It is a dark colour, so black text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#F83537#F83537

HEX#F83537

RGBrgb(248, 53, 55)

RGB (0–1)0.9725, 0.2078, 0.2157

RGB percentages97.3%, 20.8%, 21.6%

HSLhsl(359.4, 93.3%, 59%)

HSV / HSBhsv(359.4, 78.6%, 97.3%)

CMYK0%, 78.6%, 77.8%, 2.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,266,551

CSS custom property--colour: #F83537;

Brightness & contrast

Relative luminance0.22779WCAG 2.x, 0 is black and 1 is white

Perceived brightness142.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.56:1

Contrast with white3.78:1WCAG normal text: Fail

Contrast with black5.56:1WCAG normal text: AA

Greyscale equivalent#5F5F5F

Inverted#07CAC8

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#736834no red cones; affects about 1% of men; ΔE 77 from the original

Deuteranopia#A3922Eno green cones; the most common form, about 1% of men; ΔE 77 from the original

Tritanopia#FF0039no blue cones; rare, and affects men and women equally; ΔE 9.8 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text3.78:1WCAG large text: AA

Contrast with black, large text5.56:1WCAG large text: AAA

Named colours

Crimson · ΔE 15.2 Tomato · ΔE 15.4 Red · ΔE 22.4 Orange red · ΔE 22.8 Firebrick · ΔE 23.8 Coral · ΔE 28.9

Nearest named CSS colourCrimson (#DC143C)ΔE 15.18, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#35F8F6

Analogous#F83599, #F89435

Triadic#37F835, #3537F8

Split complementary#35F894, #3599F8

Tetradic#99F835, #35F8F6, #9435F8

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#FFFAFA

Lighter +30%#FDC9C9

Lighter +20%#FB9899

Lighter +10%#FA6668

Darker −10%#F2080B

Darker −20%#C00709

Darker −30%#8F0506

Darker −40%#5E0304

More saturated +25%#FF2E30

Less saturated −25%#DE4F51

Channel breakdown

R248

G53

B55

Red248 (97.3%)

Green53 (20.8%)

Blue55 (21.6%)

Hue359.38°

Saturation (HSL)93.3%

Lightness59.02%

Dominant channelRed

Hex per channelR F8 · G 35 · B 37

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Harmonies

Lighter and darker

Similar named colours

Also reads as

F83537 (chemical formula)

Formula
1,587,035.926 g/mol
83537 atoms

F83537 has a molar mass of 1,587,035.926 g/mol, made up of 83537 atoms across 1 element: 83537 × F.

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Molar mass

Molar mass1,587,035.926 g/mol

Total atoms per molecule83537

Distinct elements1

Mass of one molecule2.6353352 × 10^-18 g

Molecules per gram3.7945838 × 10^17

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 × 83537)1,587,035.926 g/mol, 100%

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Elements in this formula

Fluorine

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