Cobalt Blue Medicine Bottles Value Guide

These square cobalt blue medicine bottles represent a peak era of American pharmaceutical history between 1880 and 1920. Highly collectible for their striking deep pigment, these vessels were specifically designed to filter out UV light to preserve the chemical integrity of tonics and tinctures.

What affects the value of Cobalt Blue Medicine Bottles?

• Presence of original embossed lettering or pharmaceutical labels can significantly increase the $30-$50 base value.
• Condition of the glass, specifically the absence of 'sickness' (cloudiness) or chips on the delicate lip and base.
• Rarity of the specific square dimensions compared to more common cylindrical cobalt apothecary bottles.
• The intensity and clarity of the cobalt blue pigment, with deeper hues often commanding higher interest from glass collectors.

How to Identify Cobalt Blue Medicine Bottles?

• Look for a distinct square body shape with sharp or slightly rounded corners typical of late 19th-century manufacturing.
• Check for mold seams that may run up the sides, indicating the transition from hand-blown to machine-made production.
• Verify the deep, uniform cobalt blue color which should be consistent throughout the glass without modern surface coatings.
• Examine the base for potential maker's marks or 'pontil' scars that help date the piece to the 1880-1920 period.

History of Cobalt Blue Medicine Bottles

Cobalt blue glass was a popular choice for medicine bottles from the mid-19th to early 20th century. The dark blue color was believed to protect the contents from harmful UV light, preserving the efficacy of the medications. These bottles are often found in various shapes and sizes, reflecting the diverse range of compounds they once held, from tonics to tinctures.