Recognised as Colour

#FF374F

#FF374F
Red
Dark
Nearest: Crimson

#FF374F is a red with RGB values 255, 55, 79 and HSL 353°, 100%, 61%. It is a dark colour, so black text on it reaches 5.9:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FF374F#FF374F

HEX#FF374F

RGBrgb(255, 55, 79)

RGB (0–1)1, 0.2157, 0.3098

RGB percentages100%, 21.6%, 31%

HSLhsl(352.8, 100%, 60.8%)

HSV / HSBhsv(352.8, 78.4%, 100%)

CMYK0%, 78.4%, 69%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,725,839

CSS custom property--colour: #FF374F;

Brightness & contrast

Relative luminance0.24557WCAG 2.x, 0 is black and 1 is white

Perceived brightness148.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.91:1

Contrast with white3.55:1WCAG normal text: Fail

Contrast with black5.91:1WCAG normal text: AA

Greyscale equivalent#636363

Inverted#00C8B0

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#756D4Eno red cones; affects about 1% of men; ΔE 78.4 from the original

Deuteranopia#A69748no green cones; the most common form, about 1% of men; ΔE 79.1 from the original

Tritanopia#FF0042no blue cones; rare, and affects men and women equally; ΔE 9 from the original

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

Contrast with white, large text3.55:1WCAG large text: AA

Contrast with black, large text5.91:1WCAG large text: AAA

Named colours

Crimson · ΔE 10.2 Tomato · ΔE 20 Firebrick · ΔE 25.1 Salmon · ΔE 31.1 Brown · ΔE 31.1 Indian red · ΔE 32

Nearest named CSS colourCrimson (#DC143C)ΔE 10.2, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#37FFE7

Analogous#FF37B3, #FF8337

Triadic#4FFF37, #374FFF

Split complementary#37FF83, #37B3FF

Tetradic#B3FF37, #37FFE7, #8337FF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFD0D6

Lighter +20%#FF9DA9

Lighter +10%#FF6A7C

Darker −10%#FF0422

Darker −20%#D00019

Darker −30%#9D0013

Darker −40%#6A000D

More saturated +25%#FF374F

Less saturated −25%#E65062

Channel breakdown

R255

G55

B79

Red255 (100%)

Green55 (21.6%)

Blue79 (31%)

Hue352.8°

Saturation (HSL)100%

Lightness60.78%

Dominant channelRed

Hex per channelR FF · G 37 · B 4F

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF374F (chemical formula)

Formula
7,143.248 g/mol
376 atoms

FF374F has a molar mass of 7,143.248 g/mol, made up of 376 atoms across 1 element: 376 × F.

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Molar mass

Molar mass7,143.248 g/mol

Total atoms per molecule376

Distinct elements1

Mass of one molecule1.1861642 × 10^-20 g

Molecules per gram8.4305357 × 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 × 376)7,143.248 g/mol, 100%

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Elements in this formula

Fluorine

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