Clean Mass Teal

Old English clǣne, pure, free of dirt — used as a color modifier since the medieval period for hues that read as crisp and uncontaminated by other pigments. Clean white, clean blue: moderate saturation combined with optical clarity. Sits at the crisp-bucket center alongside clear and true.

Latin missa, Mass-of-the-Eucharist. As a color modifier, mass implies a Eucharistic-and-liturgical-feast quality, the visual register of Roman-Catholic-and-Anglican-Mass Eucharistic-and-liturgical-feast altar-and-vestment-and-incense liturgical-Mass surfaces under Mass-and-Eucharistic-feast altar-candle-and-incense light. Sits at the modifier-and-time end of the grid, parallel to vigil and vesper 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.