Recognised as Colour

#FF133B

#FF133B
Red
Dark
Nearest: Crimson

#FF133B is a red with RGB values 255, 19, 59 and HSL 350°, 100%, 54%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FF133B#FF133B

HEX#FF133B

RGBrgb(255, 19, 59)

RGB (0–1)1, 0.0745, 0.2314

RGB percentages100%, 7.5%, 23.1%

HSLhsl(349.8, 100%, 53.7%)

HSV / HSBhsv(349.8, 92.5%, 100%)

CMYK0%, 92.5%, 76.9%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,716,603

CSS custom property--colour: #FF133B;

Brightness & contrast

Relative luminance0.22042WCAG 2.x, 0 is black and 1 is white

Perceived brightness141.6 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.41:1

Contrast with white3.88:1WCAG normal text: Fail

Contrast with black5.41:1WCAG normal text: AA

Greyscale equivalent#484848

Inverted#00ECC4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6C633Ano red cones; affects about 1% of men; ΔE 85.5 from the original

Deuteranopia#A29231no green cones; the most common form, about 1% of men; ΔE 85.5 from the original

Tritanopia#FF0029no 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 text3.88:1WCAG large text: AA

Contrast with black, large text5.41:1WCAG large text: AAA

Named colours

Crimson · ΔE 15.3 Red · ΔE 23.2 Tomato · ΔE 23.3 Orange red · ΔE 27.8 Firebrick · ΔE 28.7 Brown · ΔE 36.7

Nearest named CSS colourCrimson (#DC143C)ΔE 15.27, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#13FFD7

Analogous#FF13B1, #FF6113

Triadic#3BFF13, #133BFF

Split complementary#13FF61, #13B1FF

Tetradic#B1FF13, #13FFD7, #6113FF

Tints, shades & saturation

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

Lighter +40%#FFDFE4

Lighter +30%#FFACBA

Lighter +20%#FF7990

Lighter +10%#FF4665

Darker −10%#DF0026

Darker −20%#AC001D

Darker −30%#790015

Darker −40%#46000C

More saturated +25%#FF133B

Less saturated −25%#E2314E

Channel breakdown

R255

G19

B59

Red255 (100%)

Green19 (7.5%)

Blue59 (23.1%)

Hue349.83°

Saturation (HSL)100%

Lightness53.73%

Dominant channelRed

Hex per channelR FF · G 13 · B 3B

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF133B (chemical formula)

Formula
2,556.542 g/mol
135 atoms

FF133B has a molar mass of 2,556.542 g/mol, made up of 135 atoms across 2 elements: 134 × F, 1 × B.

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Molar mass

Molar mass2,556.542 g/mol

Total atoms per molecule135

Distinct elements2

Mass of one molecule4.2452379 × 10^-21 g

Molecules per gram2.3555806 × 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

F99.6%

B0.4%

Fluorine (F × 134)2,545.732 g/mol, 99.577%

Boron (B)10.81 g/mol, 0.423%

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