Antique Newfoundland Cobalt Blue Tonic Prescriptio
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NL, Reginald Cole, Bonavista, 709-363-7975. Cobalt blue glass obtains its distinctive color through the incorporation of a cobalt compound, typically cobalt oxide or cobalt carbonate, into the glass melt.[1] Cobalt is an intense coloring agent, and only a small amount is needed to produce a noticeable blue hue. Cobalt blue medicine bottles are vintage, collectible items often made of hand-blown glass. They were used to store medicines and tonics, and their value depends on factors like age, condition, and markings.
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