Crimson & Sky Blue & Violet

Sky Blue (pale, atmospheric — the arctic twilight sky) and Violet (deep, vivid, electric — the auroral curtain) span the most dramatically different cool range — the palest atmospheric to the most deeply vivid electric-cool. Against Crimson's passionate red-aurora warm, this creates the most spectacularly Northern Lights and most cosmically dramatic atmospheric palette.

The palette is the visual world of the Northern Lights — the Aurora Borealis (Aurora Borealis — from Latin: aurora — 'dawn'; borealis — 'northern' — named by the French scientist Pierre Gassendi in 1621, though the phenomenon has been observed and described since antiquity — the most spectacular natural light display on Earth). The aurora palette: the deep vivid crimson of the low-altitude red aurora (the specific vivid crimson-to-deep-red of the highest-altitude and most dramatic aurora emission — the red color of the aurora is produced by excited atomic oxygen at altitudes above approximately 200-300 km — the 630.0 nm emission line — the most rare and most dramatic of the auroral colors); the pale clear sky blue of the Arctic twilight sky (the specific pale, luminous, slightly grey-shifted sky blue of the Arctic twilight sky in winter — when the sun is below the horizon but the sky is not fully dark, creating the most exquisitely atmospheric pale blue light — the Scandinavian 'blue hour' — Blåtime — the most celebrated twilight quality in the most northern latitudes); and the deep vivid electric violet of the most dramatic auroral curtain (the specific deep, vivid, electric violet of the aurora at the lowest altitudes — approximately 100-150 km — where the most vivid and most electric purple-to-violet colors are produced by the combined emission of molecular nitrogen — N₂⁺ — the most dramatically vivid and most electric of all the auroral colors).