Collection: Cobalt & Blue Antique Glass Bottles from NYC
Blue glass was a warning. In the 1800s and early 1900s, cobalt blue glass bottles were standard for poisons, potent medicines, and anything that needed to be visually distinct from safer household contents, a color-coded system of danger that predated childproof caps by decades. The bottles in this collection were recovered from New York City beaches, where that same glass has been waiting in the sand for a century or more. Deep cobalt is the most sought-after color in antique bottle collecting: it has a jewel-toned intensity that catches and holds light differently than any other glass. Each piece is hand-selected for color depth and character.
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Phillips Milk of Magnesia Bottle – Large Cobalt Blue Glass
Vendor:Brooklyn Sea GlassRegular price $36.99 USDRegular priceSale price $36.99 USD -
Squibb Bottle – Periwinkle Blue Glass Medicine
Vendor:Brooklyn Sea GlassRegular price $32.49 USDRegular priceSale price $32.49 USD -
Bromo Seltzer Cobalt Blue Bottles – Emerson Drug Co. Set of 2
Vendor:Brooklyn Sea GlassRegular price $32.49 USDRegular priceSale price $32.49 USD -
Cobalt Blue Medicine Bottle – Early 20th-Century Rectangular Pharmacy Glass
Vendor:Brooklyn Sea GlassRegular price $23.49 USDRegular priceSale price $23.49 USD -
Cobalt Blue Bottle – 1952 Tall Rounded Pharmacy Glass
Vendor:Brooklyn Sea GlassRegular price $32.49 USDRegular priceSale price $32.49 USD -
Squibb Bottle – Small Cobalt Blue Medicine Glass
Vendor:Brooklyn Sea GlassRegular price $24.99 USDRegular priceSale price $24.99 USD -
Phillips Bottle – Medium Cobalt Blue Milk of Magnesia Glass
Vendor:Brooklyn Sea GlassRegular price $32.49 USDRegular priceSale price $32.49 USD -
Phillips Bottle – Extra Large Cobalt Blue Milk of Magnesia Glass
Vendor:Brooklyn Sea GlassRegular price $40.99 USDRegular priceSale price $40.99 USD -
Phillips Bottle – Tall Cobalt Blue Milk of Magnesia Glass
Vendor:Brooklyn Sea GlassRegular price $23.49 USDRegular priceSale price $23.49 USD -
Fidelio Brewery Bottle – 1910s Aqua Glass New York
Vendor:Brooklyn Sea GlassRegular price $40.99 USDRegular priceSale price $40.99 USD
FAQs
What was cobalt glass originally used for?
Primarily poisons, medicines, and bitters in the 1800s and early 1900s, when color-coding bottles was one of the only safeguards against accidental poisoning.
Why is cobalt glass valuable in antique bottle collecting?
Cobalt was reserved for poisons, potent medicines, and anything meant to be visually distinct from safer household contents. That intentional scarcity, combined with its jewel-toned intensity, makes it the most sought-after color among collectors today.









