Antiseptic Pitted Sky

Greek anti- (against) plus sēptikós (putrefying) — adjectival suffix -ic. As a color modifier, antiseptic implies a clear-and-disinfected-and-clinical quality, the crisp color of medical-laboratory and operating-theater hand-scrub-and-sanitizer surfaces. Sits at the crisp-and-clean end of the grid, parallel to sterile and sanitary in usage.

Old English pyt, pit / hole. As a color modifier, pitted implies a small-hole-and-mark-pattern quality, the visual register of worn-and-pitted-stone-and-leather hand-worn-and-pitted stone-and-leather-and-metal worn-and-pitted-mark-and-hole surfaces under worn-and-pitted-stone-and-leather aged light. Sits at the modifier-and-texture end of the grid, parallel to mossed and limed 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.