Truthful Muse Sky

Old English trēowth, truth — adjectival suffix -ful. As a color modifier, truthful implies a clear-and-honest-and-direct quality where the hue carries the visual register of accurate-and-faithful-representation declaration. Sits at the crisp-and-honest end of the grid, parallel to candid and honest in usage.

Latin Musa, goddess-of-inspiration. As a color modifier, muse implies a contemplative-and-inspired-and-poetic quality, the visual register of Helicon-spring-and-Parnassus-muse hand-contemplative-and-inspired-and-poetic Helicon-spring-and-Parnassus-and-Castalian-fount mused-and-contemplative-and-inspired-and-poetic surfaces under Helicon-spring-and-Parnassus-and-Castalian-fount laurel-and-lyre-and-tablet poet's-grove-light. Sits at the modifier-and-mood end of the grid, parallel to mull and brood 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.