Fortified Cygnus Cerulean

Latin fortificāre, to make strong — past-participle of fortify. As a color modifier, fortified implies a saturated-and-strengthened-and-defensive quality, the deep-rich color of Vauban-style military-fortification stone-and-earth rampart-and-bastion architecture. Sits at the bold-and-fortified end of the grid, parallel to bastioned and armored.

Latin cygnus, swan. As a color modifier, cygnus implies a swan-flying-and-Northern-Cross quality, the visual register of Cygnus-Swan-and-Northern-Cross hand-swan-flying-and-Northern-Cross Cygnus-Swan-and-Northern-Cross-and-Bortle-1-sky cygnus-and-swan-flying-and-Northern-Cross surfaces under Cygnus-Swan-and-Northern-Cross-and-Bortle-1-sky August-and-September-late-summer-zenith Milky-Way-stellar-light. Sits at the modifier-and-cosmic end of the grid, parallel to deneb and lyra in usage.

From the Latin caeruleum, originally referring to dark blue paint pigment of the Roman world, then via French céruléen into English. As a modern art-supply name, cerulean blue is the cobalt-tin oxide pigment introduced in 1805. The color refers to a clean, slightly green-shifted blue with the matte finish of mineral pigment in linseed oil: lighter than cobalt, deeper than aqua, with the painter's weight of a word for sky.