Useful Mistral 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.

Provençal mistral, cold-northwest-wind-of-Provence. As a color modifier, mistral implies a cold-Provençal-and-Rhône-Valley-wind quality, the visual register of Provençal-and-Rhône-Valley-mistral hand-cold-Provençal-and-Rhône-Valley-wind Provençal-and-Rhône-Valley-mistral-and-Alpilles mistral-and-cold-Provençal-and-Rhône-Valley-wind surfaces under Provençal-and-Rhône-Valley-mistral-and-Alpilles Avignon-and-Saint-Rémy-and-Camargue cold-Rhône-Valley-wind-light. Sits at the modifier-and-weather end of the grid, parallel to sirocco and gust 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.