FAQ
Common questions
What makes a bottle valuable?
Age alone isn't enough. A common 1880s medicine bottle is worth $2-10. Rarity, embossing quality, unusual color, condition, and local interest drive value. A blob-top soda from a small-town brewery or a cobalt blue poison bottle can be worth hundreds. Learn your category before assuming anything is valuable.
What is sun-purple glass?
Pre-1915 glass was made with manganese dioxide as a decolorizing agent. UV radiation from decades of sunlight converts the manganese and turns the glass purple to amethyst. Genuine sun-purple takes 50-100 years of outdoor exposure to develop. Modern reproductions fake this with artificial irradiation, which shows differently under a UV flashlight.
How do I know how old a bottle is?
The mold seam is the most reliable indicator. Seam stopping below the lip suggests hand-finishing, likely pre-1880. Seam through the neck but not the lip is typically 1880-1910. Seam running through the entire bottle including the lip indicates machine-made glass, post-1910. A pontil scar on the base means pre-1870.
Where do I find old bottles?
Flea markets, estate sales, and antique malls for buying. For free finds: privy digging on private property (with permission) is the primary field method. Old home sites, farmsteads, and rural properties near pre-1920 structures are the most productive. County historical maps help locate old settlements.
Should I clean my bottles?
Only after you know what you have. A dirty common medicine bottle is worth cleaning. A rare blob-top with original soil patina should be left as found. For most common bottles, a brush and mild acid soak is appropriate. Tumblers are for heavily encrusted digger bottles you've already confirmed are common.
How much does it cost to get started?
Under $75 covers a reference guide, UV flashlight, and basic brushes. The bottles themselves can cost nearly nothing if you start at flea markets and estate sales rather than antique shops. Your first display shelves add another $40-80. Specialized tools like tumblers and ground probes can wait until you've confirmed the hobby sticks.