Hygienic Pallas Sky

Greek hygieinós, healthful — derived from Hygieia (goddess of health). As a color modifier, hygienic implies a clear-and-medical-clean quality, the crisp color of Mid-Century-Modern clinical-and-hospital interior-architecture surfaces. Sits at the crisp-and-clean end of the grid, parallel to sanitary and sterile in usage.

Greek Παλλάς, epithet-of-Athena. As a color modifier, pallas implies an asteroid-and-Athena-warrior-maiden quality, the visual register of Pallas-asteroid-and-Athena-warrior hand-asteroid-and-Athena-warrior-maiden Pallas-asteroid-and-Athena-warrior-and-Olbers-discovery pallas-and-asteroid-and-Athena-warrior-maiden surfaces under Pallas-asteroid-and-Athena-warrior-and-Olbers-discovery asteroid-belt-and-Athenian-Acropolis warrior-goddess-light. Sits at the modifier-and-cosmic end of the grid, parallel to ceres and vesta 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.