Recognised as Colour

#FF1C57

#FF1C57
Red
Dark
Nearest: Crimson

#FF1C57 is a red with RGB values 255, 28, 87 and HSL 344°, 100%, 55%. 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

#FF1C57#FF1C57

HEX#FF1C57

RGBrgb(255, 28, 87)

RGB (0–1)1, 0.1098, 0.3412

RGB percentages100%, 11%, 34.1%

HSLhsl(344.4, 100%, 55.5%)

HSV / HSBhsv(344.4, 89%, 100%)

CMYK0%, 89%, 65.9%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,718,935

CSS custom property--colour: #FF1C57;

Brightness & contrast

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

Perceived brightness144.1 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#515151

Inverted#00E3A8

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6A6657no red cones; affects about 1% of men; ΔE 84 from the original

Deuteranopia#A19350no green cones; the most common form, about 1% of men; ΔE 84.3 from the original

Tritanopia#FF003Ano blue cones; rare, and affects men and women equally; ΔE 15.5 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 12.7 Tomato · ΔE 29 Firebrick · ΔE 29.8 Brown · ΔE 34.6 Deep pink · ΔE 34.7 Indian red · ΔE 35.4

Nearest named CSS colourCrimson (#DC143C)ΔE 12.67, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#1CFFC4

Analogous#FF1CC9, #FF521C

Triadic#57FF1C, #1C57FF

Split complementary#1CFF52, #1CC9FF

Tetradic#C9FF1C, #1CFFC4, #521CFF

Tints, shades & saturation

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

Lighter +40%#FFE8EE

Lighter +30%#FFB5C8

Lighter +20%#FF82A2

Lighter +10%#FF4F7D

Darker −10%#E8003C

Darker −20%#B5002F

Darker −30%#820022

Darker −40%#4F0015

More saturated +25%#FF1C57

Less saturated −25%#E33865

Channel breakdown

R255

G28

B87

Red255 (100%)

Green28 (11%)

Blue87 (34.1%)

Hue344.41°

Saturation (HSL)100%

Lightness55.49%

Dominant channelRed

Hex per channelR FF · G 1C · B 57

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF1C57 (chemical formula)

Formula
722.623 g/mol
59 atoms

FF1C57 has a molar mass of 722.623 g/mol, made up of 59 atoms across 2 elements: 2 × F, 57 × C.

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Molar mass

Molar mass722.623 g/mol

Total atoms per molecule59

Distinct elements2

Mass of one molecule1.1999437 × 10^-21 g

Molecules per gram8.3337242 × 10^20

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

F5.3%

C94.7%

Fluorine (F × 2)37.996 g/mol, 5.258%

Carbon (C × 57)684.627 g/mol, 94.742%

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Elements in this formula

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