Pure Blue
One of the RGB primary colors, the most pure and unadulterated digital blue
#0000FFrgb(0, 0, 255)hsl(240, 100%, 50%)hsv(240, 100%, 100%)cmyk(100%, 100%, 0%, 0%)#0000FFFFrgba(0, 0, 255, 1)hsla(240, 100%, 50%, 1)oklch(45.2%, 0.313, 264)lch(32.3%, 135.6, 303)🎨 Color Palettes
♿ WCAG Contrast Colors
Learn More →📊 Color Scales
💡 Use Cases
Hyperlink Color
Default color for unvisited links across the web, guiding users through strong recognition inertia.
Glitch Art
In cyberpunk-style glitch art, the separation of the pure blue channel represents tearing and distortion of digital signals.
Screen Testing
Standard color patch for dead pixel or gamut testing on displays, evaluating blue pixel response and uniformity.
Warning Indicators
Used in UI as the highest-level blocking button, warning that the action will trigger irreversible system-level changes.
📜 Origin & History
Pure Blue is one of the three primary colors of light, holding a central position in the RGB color model. With wavelengths approximately 450 to 495 nanometers, it is one of the most penetrating short-wave colors in the visible spectrum. Since the dawn of human civilization, it has been closely tied to the sky and divine worship.
The development of electromagnetism and optical theory in the 19th century allowed scientists to precisely measure the physical parameters of blue. Maxwell, in his color photography experiments, used blue as a key channel for three-color separation—a principle that continues to underpin modern digital imaging technology.
With the birth of the internet in the 1990s, pure blue was defined in HTML as #0000FF. In early web design, pure blue hyperlinks became the core symbol of navigation—any underlined blue text conveyed the tacit understanding of clickability.
In contemporary screen calibration, pure blue serves as a benchmark color for testing display gamut coverage. Its uncompromising purity makes it an unavoidable, powerful statement in minimalist design and visual programming art.