Plain Gleam Teal

Latin planus, flat, level — used as a color modifier since the medieval period for hues that read as undecorated and direct. Plain white, plain blue: moderate saturation, no shift, no surface effect. Sits in the crisp-bucket center, with the implication of restraint rather than absence.

Old English glǣm, brightness-or-shine. As a color modifier, gleam implies a low-and-glancing-and-bright quality, the visual register of polished-armor-and-river-water-gleam hand-polished-and-glancing-and-bright polished-armor-and-river-water-and-blade-edge gleamed-and-polished-and-glancing surfaces under polished-armor-and-river-water blade-edge-and-helm-and-shield medieval-tournament-light. Sits at the modifier-and-mood end of the grid, parallel to glint and sheen 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.