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Cobalt blue by lynn

Cobalt is a chemical element with symbol Co and atomic number 27. It is found naturally only in chemically combined form. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. Cobalt-based blue pigments have been used since ancient times for jewelry and paints, and to impart a distinctive blue tint to glass.

Murano sommerso vaseline and cobalt blue glass vase under UV light

a cobalt door is kind of fantastic

Cobalt Blue Glass Dahlia Footed Lemonade Pitcher