Recognised as Colour

#FF1857

#FF1857
Red
Dark
Nearest: Crimson

#FF1857 is a red with RGB values 255, 24, 87 and HSL 344°, 100%, 55%. 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

#FF1857#FF1857

HEX#FF1857

RGBrgb(255, 24, 87)

RGB (0–1)1, 0.0941, 0.3412

RGB percentages100%, 9.4%, 34.1%

HSLhsl(343.6, 100%, 54.7%)

HSV / HSBhsv(343.6, 90.6%, 100%)

CMYK0%, 90.6%, 65.9%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,717,911

CSS custom property--colour: #FF1857;

Brightness & contrast

Relative luminance0.22601WCAG 2.x, 0 is black and 1 is white

Perceived brightness143.7 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#4E4E4E

Inverted#00E7A8

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#696557no red cones; affects about 1% of men; ΔE 84.4 from the original

Deuteranopia#A09350no green cones; the most common form, about 1% of men; ΔE 85.3 from the original

Tritanopia#FF0038no blue cones; rare, and affects men and women equally; ΔE 16.8 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 Tomato · ΔE 29.6 Firebrick · ΔE 30.2 Deep pink · ΔE 34.4 Brown · ΔE 35 Indian red · ΔE 35.9

Nearest named CSS colourCrimson (#DC143C)ΔE 13.02, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#18FFC0

Analogous#FF18CA, #FF4C18

Triadic#57FF18, #1857FF

Split complementary#18FF4C, #18CBFF

Tetradic#CBFF18, #18FFC0, #4D18FF

Tints, shades & saturation

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

Lighter +40%#FFE4EB

Lighter +30%#FFB1C6

Lighter +20%#FF7EA1

Lighter +10%#FF4B7C

Darker −10%#E4003E

Darker −20%#B10030

Darker −30%#7E0022

Darker −40%#4B0014

More saturated +25%#FF1857

Less saturated −25%#E23564

Channel breakdown

R255

G24

B87

Red255 (100%)

Green24 (9.4%)

Blue87 (34.1%)

Hue343.64°

Saturation (HSL)100%

Lightness54.71%

Dominant channelRed

Hex per channelR FF · G 18 · B 57

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF1857 (chemical formula)

Formula
35,298.284 g/mol
1858 atoms

FF1857 has a molar mass of 35,298.284 g/mol, made up of 1858 atoms across 1 element: 1858 × F.

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Molar mass

Molar mass35,298.284 g/mol

Total atoms per molecule1858

Distinct elements1

Mass of one molecule5.861418 × 10^-20 g

Molecules per gram1.7060718 × 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 × 1858)35,298.284 g/mol, 100%

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Elements in this formula

Fluorine

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