About Cyan
Cyan, #00ffff, is green and blue at full power — one of the three subtractive printing primaries (the C in CMYK) and half of every screen’s white. School color wheels skipped it; every printed page and pixel depends on it.
History
From Greek kyanos (dark blue enamel), cyan earned its throne with four-color printing in the early 20th century: magenta, yellow, black and cyan reproduce nearly everything you have ever read in print. On screens it became the color of holograms, wireframes and “the future” from Tron onward.
Psychology
Cyan is clarity and coolness at maximum voltage — water, glass, signal. It reads technological and clean; on dark grounds it is the archetypal glow of interfaces imagining tomorrow.
In design
Pure #00ffff is too hot for light themes (1.25:1 on white — invisible) and electric on dark ones: use it as the accent spark, not the body. Tempered cyans (#06b6d4, #22d3ee) are workhorse accents — this hub pairs them with violet everywhere. Complement: red.
In culture
Cyan is the color of blueprints’ successor, medical scrubs’ cousin and every sci-fi UI ever rendered. Cyanotype printing gave us “blueprint” — cyan’s first monopoly.