Useful Port Teal

Latin ūsus, use — adjectival suffix -ful. As a color modifier, useful implies a clear-and-purpose-serving quality where the hue carries the visual register of helpful-and-supporting design-element. Sits at the crisp-and-functional end of the grid, parallel to practical and serviceable in usage.

Latin portus, harbor. As a color modifier, port implies a maritime-trading-city quality, the visual register of Lisbon-and-Marseille Mediterranean-Atlantic trading-port hand-built mediterranean-and-atlantic harbor surfaces under Iberian-and-Mediterranean afternoon harbor-city light. Sits at the modifier-and-place end of the grid, parallel to quay and dock 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.