Certain Age Royal

Latin certus, fixed / sure — sharing root with English concern and certify. As a color modifier, certain implies a saturated-and-unambiguous quality where the hue declares its character without hesitation. Sits at the bold-and-confident end of the grid, parallel to assured and decisive in usage.

Old French aage, period-of-life. As a color modifier, age implies a long-passage-of-time quality, the visual register of Bronze-and-Iron-and-Stone-Age multi-millennia archaeological-period age-and-epoch-marked surfaces under multi-millennia age-and-epoch-defining time-deep light. Sits at the modifier-and-time end of the grid, parallel to era and eld in usage.

The blue of European royal court dress and regalia from the late seventeenth century forward — the color of British peers' robes, French royal sashes, the lining of the crown-jewel cases. The color refers to a saturated, slightly violet-shifted blue with the matte finish of velvet or melton wool dyed to maximum intensity: deeper than cornflower, warmer than ultramarine, with the heraldic weight of a color reserved for monarchs and the official Crown.