Effulgent Gloss Sky

Latin effulgēns, shining-out — present-participle of effulgere, sharing root with fulgor (lightning). As a color modifier, effulgent implies a saturated-and-radiating-light-out quality, the bright color of Renaissance-Madonna halo-and-aureole gold-leaf-and-pigment emission. Sits at the bright-and-saturated end of the grid, parallel to resplendent and radiant in usage.

Old Norse glosi, glossy-shine. As a color modifier, gloss implies a polished-and-reflective-shine quality, the visual register of polished-and-glossy-leather-and-lacquer hand-polished-and-glossy lacquer-and-shellac-and-varnish polished-and-glossy-shine surfaces under polished-and-glossy-lacquer workshop-light. Sits at the modifier-and-texture end of the grid, parallel to sheen and shine 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.