Recognised as Colour

#FFF21B

#FFF21B
Yellow
Light
Nearest: Yellow

#FFF21B is a yellow with RGB values 255, 242, 27 and HSL 57°, 100%, 55%. It is a light colour, so black text on it reaches 18:1 contrast (AAA for normal text). The nearest named colour is Yellow.

Colour values

#FFF21B#FFF21B

HEX#FFF21B

RGBrgb(255, 242, 27)

RGB (0–1)1, 0.949, 0.1059

RGB percentages100%, 94.9%, 10.6%

HSLhsl(56.6, 100%, 55.3%)

HSV / HSBhsv(56.6, 89.4%, 100%)

CMYK0%, 5.1%, 89.4%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,773,659

CSS custom property--colour: #FFF21B;

Brightness & contrast

Relative luminance0.84843WCAG 2.x, 0 is black and 1 is white

Perceived brightness232.2 of 255ITU-R BT.601 weighting

Light or darkLight

Best text colour on this backgroundBlackcontrast 17.97:1

Contrast with white1.17:1WCAG normal text: Fail

Contrast with black17.97:1WCAG normal text: AAA

Greyscale equivalent#E5E5E5

Inverted#000DE4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#FFE900no red cones; affects about 1% of men; ΔE 4.8 from the original

Deuteranopia#FFF136no green cones; the most common form, about 1% of men; ΔE 5.9 from the original

Tritanopia#FFE1CFno blue cones; rare, and affects men and women equally; ΔE 80.2 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text1.17:1WCAG large text: Fail

Contrast with black, large text17.97:1WCAG large text: AAA

Named colours

Yellow · ΔE 8.9 Gold · ΔE 15 Yellow green · ΔE 36.7 Green yellow · ΔE 38.2 Goldenrod · ΔE 38.9 Orange · ΔE 44.6

Nearest named CSS colourYellow (#FFFF00)ΔE 8.86, clearly different but related

Hue familyyellow

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#1B28FF

Analogous#FF801B, #9AFF1B

Triadic#1BFFF2, #F21BFF

Split complementary#1B9AFF, #801BFF

Tetradic#1BFF80, #1B28FF, #FF1B9A

Tints, shades & saturation

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

Lighter +40%#FFFEE7

Lighter +30%#FFFBB4

Lighter +20%#FFF881

Lighter +10%#FFF54E

Darker −10%#E7DA00

Darker −20%#B4AA00

Darker −30%#817A00

Darker −40%#4E4A00

More saturated +25%#FFF21B

Less saturated −25%#E3D937

Channel breakdown

R255

G242

B27

Red255 (100%)

Green242 (94.9%)

Blue27 (10.6%)

Hue56.58°

Saturation (HSL)100%

Lightness55.29%

Dominant channelRed

Hex per channelR FF · G F2 · B 1B

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FFF21B (chemical formula)

Formula
447.764 g/mol
24 atoms

FFF21B has a molar mass of 447.764 g/mol, made up of 24 atoms across 2 elements: 23 × F, 1 × B.

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Molar mass

Molar mass447.764 g/mol

Total atoms per molecule24

Distinct elements2

Mass of one molecule7.4352961 × 10^-22 g

Molecules per gram1.3449363 × 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

F97.6%

B2.4%

Fluorine (F × 23)436.954 g/mol, 97.586%

Boron (B)10.81 g/mol, 2.414%

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