Lucid Lent Sky

Latin lūcidus, clear / bright — derived from lūx (light). As a color modifier, lucid implies a clear-and-readable quality where the hue is unambiguous and free of optical clutter. Sits at the crisp-and-clear end of the grid, parallel to pellucid and plain in usage.

Latin Lententide, Lent / spring. As a color modifier, lent implies a Lenten-and-fasting-and-purple quality, the visual register of Roman-Catholic-and-Anglican Lenten-period purple-vestment-and-fast-and-ash-Wednesday liturgical surfaces under Lenten-purple ecclesiastical-vestment candlelight. Sits at the modifier-and-time end of the grid, parallel to advent and easter in usage.

The blue of a clear sky at noon — produced by Rayleigh scattering, the preferential dispersion of shorter wavelengths through atmospheric molecules. Air itself is colorless; the color we see is sunlight scattered toward our eyes by every cubic kilometer above. The reference shade is mid-latitude noon under a high pressure system: a clean, slightly green-shifted blue with the luminous depth of light scattered across an entire hemisphere of air.