Recognised as Colour

#FF1B27

#FF1B27
Red
Dark
Nearest: Red

#FF1B27 is a red with RGB values 255, 27, 39 and HSL 357°, 100%, 55%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FF1B27#FF1B27

HEX#FF1B27

RGBrgb(255, 27, 39)

RGB (0–1)1, 0.1059, 0.1529

RGB percentages100%, 10.6%, 15.3%

HSLhsl(356.8, 100%, 55.3%)

HSV / HSBhsv(356.8, 89.4%, 100%)

CMYK0%, 89.4%, 84.7%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,718,631

CSS custom property--colour: #FF1B27;

Brightness & contrast

Relative luminance0.2219WCAG 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 5.44:1

Contrast with white3.86:1WCAG normal text: Fail

Contrast with black5.44:1WCAG normal text: AA

Greyscale equivalent#4C4C4C

Inverted#00E4D8

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6F6323no red cones; affects about 1% of men; ΔE 84.4 from the original

Deuteranopia#A49217no green cones; the most common form, about 1% of men; ΔE 84.1 from the original

Tritanopia#FF0025no blue cones; rare, and affects men and women equally; ΔE 2.5 from the original

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

Contrast with white, large text3.86:1WCAG large text: AA

Contrast with black, large text5.44:1WCAG large text: AAA

Named colours

Red · ΔE 12.7 Orange red · ΔE 18 Tomato · ΔE 23.3 Crimson · ΔE 23.4 Firebrick · ΔE 31.8 Coral · ΔE 36

Nearest named CSS colourRed (#FF0000)ΔE 12.74, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#1BFFF3

Analogous#FF1B99, #FF811B

Triadic#27FF1B, #1B27FF

Split complementary#1BFF81, #1B99FF

Tetradic#99FF1B, #1BFFF3, #811BFF

Tints, shades & saturation

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

Lighter +40%#FFE7E8

Lighter +30%#FFB4B8

Lighter +20%#FF8188

Lighter +10%#FF4E57

Darker −10%#E7000C

Darker −20%#B40009

Darker −30%#810007

Darker −40%#4E0004

More saturated +25%#FF1B27

Less saturated −25%#E33740

Channel breakdown

R255

G27

B39

Red255 (100%)

Green27 (10.6%)

Blue39 (15.3%)

Hue356.84°

Saturation (HSL)100%

Lightness55.29%

Dominant channelRed

Hex per channelR FF · G 1B · B 27

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF1B27 (chemical formula)

Formula
329.866 g/mol
29 atoms

FF1B27 has a molar mass of 329.866 g/mol, made up of 29 atoms across 2 elements: 2 × F, 27 × B.

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Molar mass

Molar mass329.866 g/mol

Total atoms per molecule29

Distinct elements2

Mass of one molecule5.4775538 × 10^-22 g

Molecules per gram1.8256325 × 10^21

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

F11.5%

B88.5%

Fluorine (F × 2)37.996 g/mol, 11.519%

Boron (B × 27)291.87 g/mol, 88.481%

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