Aureolin

HEX: #FDEE00 | Modern Palette

On White
1.21:1
FAIL
On Black
17.41:1
PASS

Color Specifications

HEX
#FDEE00
RGB
253, 238, 0
HSL
56°, 100% ,49%
CMYK
0, 6, 100, 1

About Aureolin

Aureolin (#FDEE00) is a color with RGB(253, 238, 0) and HSL(56.4°, 100%, 49.6%). It is commonly associated with Energetic, Bold moods. In design, it fits Vivid, Warm styles and is suitable for Text, Button, Accent. Its complementary color is #000FFD, which creates strong contrast. Its triadic palette includes #00FDEE and #EE00FD. The name comes from aureolus (Latin).

  • HEX: #FDEE00
  • RGB: 253, 238, 0
  • HSL: 56.4°, 100%, 49.6%
  • Mood: Energetic, Bold
  • Style: Vivid, Warm
  • Use case: Text, Button, Accent
  • Complementary color: #000FFD
  • Triadic colors: #00FDEE, #EE00FD
  • The name comes from aureolus (Latin).

Live Components

LIGHT
DARK
System Notification Box

Color Palettes

Aureolin #FDEE00 is used in Monochromatic, Neutral + Accent, Analogous, 3 + 1 + 1 palettes, giving designers ready-made combinations for backgrounds, surfaces, accents, and interface elements.

Monochromatic Five tones of the same hue — a reliable scale for backgrounds, surfaces, and text.
 
 
AUREOLIN
 
 
Neutral + Accent Four near-neutral tones grounded by a saturated accent — clean and versatile for UI.
 
 
AUREOLIN
 
 
Analogous Five hues drifting across a 60° arc — naturally harmonious and pleasing to the eye.
 
 
AUREOLIN
 
 
3 + 1 + 1 Three analogous base colors, one complementary accent, one dark anchor — bold yet balanced.
 
 
 
 
 

Color Harmonies

Aureolin #FDEE00 pairs with #000FFD as its complementary color, and #00FDEE and #EE00FD in triadic combinations. These harmony relationships help create balanced color combinations for UI, branding, and design work.

Complementary

The color directly opposite on the color wheel — creates maximum contrast and vibrance.

AUREOLIN
Analogous

Colors adjacent on the wheel — naturally harmonious and pleasing to the eye.

AUREOLIN
Triadic

Three colors equally spaced 120° apart — bold, balanced, and visually rich.

AUREOLIN
Split-Complementary

Two colors flanking the complement — high contrast with less tension than full complementary.

AUREOLIN
Tetradic (Square)

Four colors at 90° intervals — rich variety, best when one color dominates.

AUREOLIN
Monochromatic

Shades and tints of the same hue — cohesive, elegant, and easy to work with.

AUREOLIN

Shades & Tints

The shade and tint range for Aureolin #FDEE00 moves from dark #1A1800 tones through the base color to lighter #FFFDE6 tones, making it useful for depth, hierarchy, and background variation.

AUREOLIN

Color Characteristics

Mood
Energetic Bold
Style
Vivid Warm
Use case
Text Button Accent

Accessibility Simulation

Deuteranopia #F2F200
Protanopia #F0F002
Tritanopia #FFE0E0
Achromatopsia #EAEAEA

Frequently Asked Questions

Aureolin (#FDEE00) is a color with RGB(253, 238, 0) and HSL(56.4°, 100%, 49.6%).

#FDEE00 pairs strongly with #000FFD as its complementary color. It can also be used with neutral tones for balanced UI and design layouts.

#FDEE00 is suitable for Text, Button, Accent and works well with Vivid, Warm styles.

#FDEE00 is commonly associated with Energetic, Bold.

The name Aureolin is linked to aureolus from Latin, meaning golden.

Name, History & Etymology

Origin Word aureolus
Meaning golden
Language Latin
First Recorded Use 19th Century

History

Aureolin, also known as Cobalt Yellow, is a synthetic inorganic pigment. It was first prepared in 1848 by Nikolaus Wolfgang Fischer in Breslau, Germany, and introduced to artists' palettes around 1851. It quickly gained popularity among watercolorists and oil painters due to its transparent, bright yellow hue, which was a welcome addition to the limited range of stable yellow pigments available at the time. Before aureolin, many yellow pigments were either fugitive (faded over time) or toxic. Its chemical composition is potassium cobaltinitrite (K3[Co(NO2)6]).

First Recorded Use

1851

Cultural Associations

Aureolin was particularly favored by Impressionist and Post-Impressionist painters for its luminosity and transparency, making it ideal for capturing light effects and atmospheric qualities. Artists like Vincent van Gogh and Claude Monet are believed to have used aureolin in some of their works. However, over time, it was discovered that aureolin can be somewhat unstable, particularly in oil paints, where it can darken or turn greenish-yellow, especially when exposed to light or certain other pigments. This instability led to a decline in its use in the 20th century, though it is still available today, often with improved formulations.

Similar Named Colors
Canary Yellow #FFEF00 ΔE 0.33
Yellow Rose #FFF000 ΔE 0.43
Cadmium Yellow #FFF600 ΔE 1.96
Lemon #FFF700 ΔE 2.22

Code Snippets

/* Background */
.element {
    background-color: #FDEE00;
}

/* Text */
.element {
    color: #FDEE00;
}

/* Border */
.element {
    border: 1px solid #FDEE00;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #FDEE00,
        #000FFD
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #FDEE00,
        #000FFD
    );
}

// SCSS variable
$aureolin: #FDEE00;

// With RGB channels (useful for rgba() usage)
$aureolin-r: 253;
$aureolin-g: 238;
$aureolin-b: 0;

// Usage
.element {
    background-color: $aureolin;
    color: rgba($aureolin-r, $aureolin-g, $aureolin-b, 0.8);
}