Crimson & Cobalt & Rose

Cobalt (medium, vivid — the Bohemian cobalt blue glass — Kobaltglas — the most historically significant and most internationally celebrated blue glass in the world) and Rose (vivid, electric — the Bohemian uranium opaline glass — the most specifically Bohemian and most historically unusual glass color — produced by adding uranium oxide to the glass melt, creating a vivid yellow-to-green glass that, when thick, shifts toward a vivid rose-to-pink) create the most specifically Bohemian and most historically significant glass-tradition cool-warm pair. Against Crimson's passionate Bohemian ruby glass warm, this creates the most specifically Bohemian glass art and most historically rich glassmaking palette.

The palette is the visual world of Bohemian glassmaking — the most celebrated and most internationally significant glassmaking tradition in the world (Bohemia — the most westerly region of the Czech Republic — centered on the Krušné hory — Ore Mountains — on the border between Bohemia and Saxony — the most important glassmaking region in the world from the 16th century through the 20th century). The Bohemian glass palette: the deep vivid crimson of Bohemian ruby glass (the most prestigious and most technically demanding of all Bohemian glass types — produced by adding gold chloride — HAuCl₄ — to the glass melt — and requiring the most precisely controlled reheating — 'striking' — to develop the characteristic deep ruby-to-crimson color — the most expensive and most technically demanding glass in the entire Bohemian tradition); the medium vivid cobalt of Bohemian cobalt glass (the most widely produced and most internationally distributed Bohemian colored glass type — produced by adding cobalt oxide to the glass melt — the specific medium, vivid, intensely saturated cobalt blue of Bohemian glass — slightly cooler and slightly more vivid than the azurite pigment used in painting, and significantly more pure than the smalt glass); and the vivid electric rose of Bohemian uranium opaline glass (the specific vivid, electric, slightly blue-shifted rose-to-pink of Bohemian uranium opaline glass — produced by adding uranium oxide — UO₂ or U₃O₈ — to an opaline glass base — the uranium-containing glass fluorescently glows vivid rose-to-pink under ultraviolet light, and appears a characteristic vivid rose-to-electric-pink under daylight).