Recognised as Colour

#FF2B10

#FF2B10
Red
Dark
Nearest: Red

#FF2B10 is a red with RGB values 255, 43, 16 and HSL 7°, 100%, 53%. It is a dark colour, so black text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FF2B10#FF2B10

HEX#FF2B10

RGBrgb(255, 43, 16)

RGB (0–1)1, 0.1686, 0.0627

RGB percentages100%, 16.9%, 6.3%

HSLhsl(6.8, 100%, 53.1%)

HSV / HSBhsv(6.8, 93.7%, 100%)

CMYK0%, 83.1%, 93.7%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,722,704

CSS custom property--colour: #FF2B10;

Brightness & contrast

Relative luminance0.23025WCAG 2.x, 0 is black and 1 is white

Perceived brightness143.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.61:1

Contrast with white3.75:1WCAG normal text: Fail

Contrast with black5.61:1WCAG normal text: AA

Greyscale equivalent#565656

Inverted#00D4EF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#756601no red cones; affects about 1% of men; ΔE 80.8 from the original

Deuteranopia#A79400no green cones; the most common form, about 1% of men; ΔE 80.9 from the original

Tritanopia#FF002Ano blue cones; rare, and affects men and women equally; ΔE 13.1 from the original

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

Contrast with white, large text3.75:1WCAG large text: AA

Contrast with black, large text5.61:1WCAG large text: AAA

Named colours

Red · ΔE 6.2 Orange red · ΔE 9 Tomato · ΔE 25.7 Crimson · ΔE 31.9 Coral · ΔE 36.1 Firebrick · ΔE 36.4

Nearest named CSS colourRed (#FF0000)ΔE 6.24, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#10E4FF

Analogous#FF106D, #FFA310

Triadic#10FF2B, #2B10FF

Split complementary#10FFA2, #106DFF

Tetradic#6DFF10, #10E4FF, #A210FF

Tints, shades & saturation

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

Lighter +40%#FFE0DC

Lighter +30%#FFB3A9

Lighter +20%#FF8576

Lighter +10%#FF5843

Darker −10%#DC1900

Darker −20%#A91300

Darker −30%#760D00

Darker −40%#430800

More saturated +25%#FF2B10

Less saturated −25%#E1422E

Channel breakdown

R255

G43

B16

Red255 (100%)

Green43 (16.9%)

Blue16 (6.3%)

Hue6.78°

Saturation (HSL)100%

Lightness53.14%

Dominant channelRed

Hex per channelR FF · G 2B · B 10

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF2B10 (chemical formula)

Formula
165.094 g/mol
13 atoms

FF2B10 has a molar mass of 165.094 g/mol, made up of 13 atoms across 2 elements: 3 × F, 10 × B.

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Molar mass

Molar mass165.094 g/mol

Total atoms per molecule13

Distinct elements2

Mass of one molecule2.7414504 × 10^-22 g

Molecules per gram3.6477042 × 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

F34.5%

B65.5%

Fluorine (F × 3)56.994 g/mol, 34.522%

Boron (B × 10)108.1 g/mol, 65.478%

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