Recognised as Colour

#FF1F3F

#FF1F3F
Red
Dark
Nearest: Crimson

#FF1F3F is a red with RGB values 255, 31, 63 and HSL 351°, 100%, 56%. It is a dark colour, so black text on it reaches 5.5:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FF1F3F#FF1F3F

HEX#FF1F3F

RGBrgb(255, 31, 63)

RGB (0–1)1, 0.1216, 0.2471

RGB percentages100%, 12.2%, 24.7%

HSLhsl(351.4, 100%, 56.1%)

HSV / HSBhsv(351.4, 87.8%, 100%)

CMYK0%, 87.8%, 75.3%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,719,679

CSS custom property--colour: #FF1F3F;

Brightness & contrast

Relative luminance0.22599WCAG 2.x, 0 is black and 1 is white

Perceived brightness143 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.52:1

Contrast with white3.8:1WCAG normal text: Fail

Contrast with black5.52:1WCAG normal text: AA

Greyscale equivalent#515151

Inverted#00E0C0

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6E653Eno red cones; affects about 1% of men; ΔE 83.8 from the original

Deuteranopia#A39336no green cones; the most common form, about 1% of men; ΔE 83.9 from the original

Tritanopia#FF0030no blue cones; rare, and affects men and women equally; ΔE 7.6 from the original

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

Contrast with white, large text3.8:1WCAG large text: AA

Contrast with black, large text5.52:1WCAG large text: AAA

Named colours

Crimson · ΔE 13.7 Tomato · ΔE 22 Red · ΔE 24.9 Firebrick · ΔE 27.5 Orange red · ΔE 28.7 Brown · ΔE 35.3

Nearest named CSS colourCrimson (#DC143C)ΔE 13.71, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#1FFFDF

Analogous#FF1FAF, #FF6F1F

Triadic#3FFF1F, #1F3FFF

Split complementary#1FFF6F, #1FAFFF

Tetradic#AFFF1F, #1FFFDF, #6F1FFF

Tints, shades & saturation

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

Lighter +40%#FFEBEE

Lighter +30%#FFB8C2

Lighter +20%#FF8596

Lighter +10%#FF526B

Darker −10%#EB0022

Darker −20%#B8001A

Darker −30%#850013

Darker −40%#52000C

More saturated +25%#FF1F3F

Less saturated −25%#E33B53

Channel breakdown

R255

G31

B63

Red255 (100%)

Green31 (12.2%)

Blue63 (24.7%)

Hue351.43°

Saturation (HSL)100%

Lightness56.08%

Dominant channelRed

Hex per channelR FF · G 1F · B 3F

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF1F3F (chemical formula)

Formula
113.988 g/mol
6 atoms

FF1F3F has a molar mass of 113.988 g/mol, made up of 6 atoms across 1 element: 6 × F.

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Molar mass

Molar mass113.988 g/mol

Total atoms per molecule6

Distinct elements1

Mass of one molecule1.8928153 × 10^-22 g

Molecules per gram5.2831357 × 10^21

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 × 6)113.988 g/mol, 100%

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Elements in this formula

Fluorine

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