Imperial Lace Indigo

From the Latin imperialis, of the empire — applied to color since the medieval period for the hues reserved for sovereigns and empires: imperial purple of Tyrian dye, imperial yellow of Ming-dynasty porcelain. As a modifier, imperial implies saturation combined with the institutional weight of a color owned by a court. Sits in the bold-and-deep corner, alongside royal.

Old French laz, cord / lace. As a color modifier, lace implies a hand-tatted-and-decorative-net quality, the visual register of Edwardian-and-Belgian-Bruges-lace hand-tatted-and-bobbin-lace bridal-and-formal-wear delicate-network-pattern textile surfaces under Bruges-and-Edwardian hand-tatted-lace filtered light. Sits at the modifier-and-texture end of the grid, parallel to silk and fluff in usage.

Indigofera tinctoria, the South Asian legume whose leaves yield the deep blue dye that has clothed humanity for at least four thousand years — Egyptian linen, Mayan textile, the slave-grown plantations of Carolina. The color refers to a freshly indigo-dyed cotton thread: a saturated, slightly violet-shifted deep blue with the slight lustre of a fiber surface oxidized in air. Deeper than cobalt, cooler than royal.