Cool Sigh 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.

Middle English sighen, to-breathe-out-audibly. As a color modifier, sigh implies a breathed-out-and-released-and-wistful quality, the visual register of Romantic-poet-and-pining-lover-sigh hand-breathed-out-and-released-and-pining Romantic-poet-and-pining-lover-and-bedside-vigil sighed-and-released-and-breathed-out surfaces under Romantic-poet-and-pining-lover candle-lit-and-bedside-vigil window-and-balcony-light. Sits at the modifier-and-mood end of the grid, parallel to yearn and brood 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.