Cyan as a precise colour term entered common usage with the development of colour printing (CMYK — Cyan, Magenta, Yellow, Key/Black) and later digital colour (RGB). It is one of the three primary colours in subtractive colour mixing (printing) and one of the secondary colours in additive mixing (light). Its precision as a colour concept is essentially technological.

Clear, technological, and slightly cold. Cyan sits at the intersection of blue's calm and green's freshness. In its pure form it can feel synthetic and digital — it is associated with screens, water, and technology. At lower saturation it becomes turquoise and feels more natural. Its precision makes it feel modern and efficient.

Cyan is fundamental to the modern visual world through CMYK printing — every printed image uses cyan as one of its four basic inks. The "cyan screen of death" on some early computers made it briefly notorious. In healthcare, cyan is used in some surgical lighting systems because it provides good colour rendering for tissue while reducing eye fatigue.