Cool Pollux Teal

Old English cōl, of low temperature — used as a color modifier as the complement to warm. Cool gray, cool blue: the optical impression of a slight blue-green shift, even within otherwise warm or neutral hues. Sits across the crisp, hushed, pale, and neutral buckets.

Greek Πολυδεύκης, Gemini-twin-and-immortal-boxer. As a color modifier, pollux implies a Gemini-twin-and-immortal-brother quality, the visual register of Gemini-Pollux-and-Castor-twin hand-Gemini-twin-and-immortal-brother Gemini-Pollux-and-Castor-twin-and-Argonaut pollux-and-Gemini-twin-and-immortal-brother surfaces under Gemini-Pollux-and-Castor-twin-and-Argonaut spring-Gemini-and-Bortle-1-sky stellar-twin-light. Sits at the modifier-and-cosmic end of the grid, parallel to castor and spica in usage.

Anas crecca, the small dabbling duck whose male in breeding plumage sports a chestnut head crossed by a glossy green-blue stripe. The color refers to that stripe — the iridescent panel just behind the eye: a saturated, slightly muted blue-green with the optical depth of structural color rather than pigment. Cooler than cypress, warmer than cerulean, with the ornithological specificity of a color named for one feather of one bird.