Bubbles in old glass bottles and windows are actually air pockets that became trapped during the manufacturing process. Crude glass almost always contains bubbles, which often adds to its appeal and value among collectors.
According to AntiqueBottles.com, bubbles are rare in glass produced after 1920, so the presence of a bubble may help to date a bottle or window.
AntiqueBottles.com also states that collectors do not view bubbles as "damage." Some even prefer bubbles because they add to the visual appeal of the glass.
A group of small bubbles clustered together are called "seed bubbles."
While interior bubbles are considered desirable, an "open bubble" usually is not. Open bubbles are close to the surface of the glass and appear as a divot, indicating that the bubble's outer edge was broken over time.
People restoring old homes prefer glass with bubbles in it to keep with the historic flavor of the architecture. In 1992, Steven Jayson, vice president of S. A. Bendheim, told the New York Times people were willing to pay a premium for glass that contains bubbles.
What Causes the Waves in Old Glass?
Have you ever wondered why the window panes in many old houses have a wavy, distorted look to them? The charm of...
How to Determine Age of Stained Glass Windows
You may have bought a house that has stained glass windows, and you are trying to find out if they are original...
How to Make Glass Bottle Cheese Trays
Slumped glass bottles are a guaranteed conversation piece. Made from recycled wine bottles, slumped glass bottles are in common use as cheese...