Heartening Vandal Sky

Old English heorte (heart) — present-participle of hearten. As a color modifier, heartening implies a clear-and-uplifting-and-encouraging quality where the hue carries the visual register of cheerful-encouraging color-tone. Sits at the crisp-and-cheerful end of the grid, parallel to welcoming and cheerful in usage.

Latin Vandalus, of-the-Vandals. As a color modifier, vandal implies a Germanic-tribal-migration quality, the visual register of Vandal-Kingdom-of-Carthage late-Roman-period hand-built Germanic-Migration-period kingdom-and-fortification surfaces under late-Roman Vandal-Kingdom-of-Carthage Migration-Period sky. Sits at the modifier-and-cultural end of the grid, parallel to goth and hun 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.