Recognised as Colour

#F42101

#F42101
Red
Dark
Nearest: Red

#F42101 is a red with RGB values 244, 33, 1 and HSL 8°, 99%, 48%. It is a dark colour, so black text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#F42101#F42101

HEX#F42101

RGBrgb(244, 33, 1)

RGB (0–1)0.9569, 0.1294, 0.0039

RGB percentages95.7%, 12.9%, 0.4%

HSLhsl(7.9, 99.2%, 48%)

HSV / HSBhsv(7.9, 99.6%, 95.7%)

CMYK0%, 86.5%, 99.6%, 4.3%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer15,999,233

CSS custom property--colour: #F42101;

Brightness & contrast

Relative luminance0.20323WCAG 2.x, 0 is black and 1 is white

Perceived brightness135.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.06:1

Contrast with white4.15:1WCAG normal text: Fail

Contrast with black5.06:1WCAG normal text: AA

Greyscale equivalent#4C4C4C

Inverted#0BDEFE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6D5F00no red cones; affects about 1% of men; ΔE 80.3 from the original

Deuteranopia#9F8C00no green cones; the most common form, about 1% of men; ΔE 79.2 from the original

Tritanopia#FF0021no blue cones; rare, and affects men and women equally; ΔE 10.7 from the original

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

Contrast with white, large text4.15:1WCAG large text: AA

Contrast with black, large text5.06:1WCAG large text: AAA

Named colours

Red · ΔE 6.6 Orange red · ΔE 9 Tomato · ΔE 26.6 Crimson · ΔE 32.2 Firebrick · ΔE 35.4 Coral · ΔE 36.8

Nearest named CSS colourRed (#FF0000)ΔE 6.59, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#01D4F4

Analogous#F4015B, #F49A01

Triadic#01F421, #2101F4

Split complementary#01F49B, #015AF4

Tetradic#5BF401, #01D4F4, #9A01F4

Tints, shades & saturation

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

Lighter +40%#FFCAC2

Lighter +30%#FF9E8F

Lighter +20%#FE725D

Lighter +10%#FE462A

Darker −10%#C11A01

Darker −20%#8E1301

Darker −30%#5C0C00

Darker −40%#290600

More saturated +25%#F52000

Less saturated −25%#D53820

Channel breakdown

R244

G33

Red244 (95.7%)

Green33 (12.9%)

Blue1 (0.4%)

Hue7.9°

Saturation (HSL)99.18%

Lightness48.04%

Dominant channelRed

Hex per channelR F4 · G 21 · B 01

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Harmonies

Lighter and darker

Similar named colours

Also reads as

F42101 (chemical formula)

Formula
799,834.798 g/mol
42101 atoms

F42101 has a molar mass of 799,834.798 g/mol, made up of 42101 atoms across 1 element: 42101 × F.

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Molar mass

Molar mass799,834.798 g/mol

Total atoms per molecule42101

Distinct elements1

Mass of one molecule1.3281569 × 10^-18 g

Molecules per gram7.5292308 × 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 × 42101)799,834.798 g/mol, 100%

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Elements in this formula

Fluorine

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