Recognised as Colour

#FF1851

#FF1851
Red
Dark
Nearest: Crimson

#FF1851 is a red with RGB values 255, 24, 81 and HSL 345°, 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

#FF1851#FF1851

HEX#FF1851

RGBrgb(255, 24, 81)

RGB (0–1)1, 0.0941, 0.3176

RGB percentages100%, 9.4%, 31.8%

HSLhsl(345.2, 100%, 54.7%)

HSV / HSBhsv(345.2, 90.6%, 100%)

CMYK0%, 90.6%, 68.2%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,717,905

CSS custom property--colour: #FF1851;

Brightness & contrast

Relative luminance0.22507WCAG 2.x, 0 is black and 1 is white

Perceived brightness143.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.5:1

Contrast with white3.82:1WCAG normal text: Fail

Contrast with black5.5:1WCAG normal text: AA

Greyscale equivalent#4D4D4D

Inverted#00E7AE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6A6551no red cones; affects about 1% of men; ΔE 84.7 from the original

Deuteranopia#A1934Ano green cones; the most common form, about 1% of men; ΔE 85.1 from the original

Tritanopia#FF0035no blue cones; rare, and affects men and women equally; ΔE 15 from the original

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

Contrast with white, large text3.82:1WCAG large text: AA

Contrast with black, large text5.5:1WCAG large text: AAA

Named colours

Crimson · ΔE 11.8 Tomato · ΔE 27.5 Firebrick · ΔE 29.1 Brown · ΔE 34.7 Red · ΔE 35.4 Indian red · ΔE 36.4

Nearest named CSS colourCrimson (#DC143C)ΔE 11.8, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#18FFC6

Analogous#FF18C4, #FF5318

Triadic#51FF18, #1851FF

Split complementary#18FF53, #18C4FF

Tetradic#C4FF18, #18FFC6, #5318FF

Tints, shades & saturation

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

Lighter +40%#FFE4EB

Lighter +30%#FFB1C4

Lighter +20%#FF7E9E

Lighter +10%#FF4B77

Darker −10%#E40038

Darker −20%#B1002C

Darker −30%#7E001F

Darker −40%#4B0013

More saturated +25%#FF1851

Less saturated −25%#E23560

Channel breakdown

R255

G24

B81

Red255 (100%)

Green24 (9.4%)

Blue81 (31.8%)

Hue345.19°

Saturation (HSL)100%

Lightness54.71%

Dominant channelRed

Hex per channelR FF · G 18 · B 51

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF1851 (chemical formula)

Formula
35,184.296 g/mol
1852 atoms

FF1851 has a molar mass of 35,184.296 g/mol, made up of 1852 atoms across 1 element: 1852 × F.

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Molar mass

Molar mass35,184.296 g/mol

Total atoms per molecule1852

Distinct elements1

Mass of one molecule5.8424898 × 10^-20 g

Molecules per gram1.711599 × 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 × 1852)35,184.296 g/mol, 100%

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Elements in this formula

Fluorine

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