Dark Fur Ultramarine

Old English deorc, dark, gloomy — cognate with the German dunkel and the Latin terra, earth, both pointing to a base meaning of covered or obscured. As a color modifier, dark sits on the lightness axis only: it says nothing about hue or saturation, only that the value is low. Used across every adjective bucket the engine routes to when L < 0.40.

Old French forrer, to-line-with-fur. As a color modifier, fur implies a soft-pelt-and-mammal-coat quality, the visual register of Russian-and-Canadian-fur hand-trapped-and-prepared mink-and-sable-and-fox Russian-and-Canadian-fur-coat-and-trim surfaces under Russian-and-Canadian hand-trapped-fur-coat-and-trim atelier light. Sits at the modifier-and-texture end of the grid, parallel to pelt and fluff in usage.

The pigment ground from lapis lazuli — the Afghan mineral imported through Venice in the late Middle Ages, more expensive by weight than gold during the Renaissance. The color refers to a freshly mixed ultramarine pigment in linseed oil: a saturated, slightly violet-shifted deep blue with the matte finish of micron-ground rock. Deeper than cobalt, cooler than royal, with the art-historical weight of the blue Vermeer reserved for Mary's robe.