blueF

blueF is a fictional term used in design theory and software documentation to illustrate how blue-centered color systems might be standardized across interfaces. The concept is not an official standard; it has appeared in coursework, design blogs, and speculative projects as an example.

The blueF palette is described as a ten-point series, blueF-0 to blueF-9, arranged from light to deep. It proposes a color space with specific luminance and chroma values to achieve perceptual uniformity; often cited values resemble a simplified CIE-based model, though exact coordinates vary by source. Designers use blueF to demonstrate contrast relationships with white and with neutral grays.

Implementation typically includes a naming convention and reusable assets: CSS variables, a small palette generator, and sample UI components. The system emphasizes accessibility, recommending contrast ratios of at least 4.5:1 for body text and higher for UI elements, and suggesting pairings with neutral tones to avoid saturation clashes.

History and reception: blueF originated in teaching materials in the early 2010s as a didactic example for color science in UI design. While useful for discussion, it has no formal committee or standard body endorsing it, and real-world adoption remains limited to educational contexts.

See also color theory, color palette, UI design, and WCAG.