Dating fostoria glass
Glass does have not the same chemical make up as crystal: fine crystal is glass to which lead has been added for sparkle, and strength.
Although people sometimes think of lead crystal as heavy (which it can be), lead also makes the glass strong enough to be spun or molded into thin shapes and remain resilient.
If you're starting or adding to your collection, be aware of the differences between crystal stemware and regular glassware. In the "Chicago Tribune," Michele Fecht writes that true crystal has a "lead content of at least 24 percent," but glass doesn't contain lead.
This lead content gives crystal its signature qualities, contributing to its strength and weight.
Tap or clink a crystal glass, and it produces a “ping” sound, while an ordinary glass makes a dull sound.
Another useful test is by wetting your finger and running it along the rim of the crystal, which produces a tonal effect similar to a musical note.
Additionally, when light passes through true crystal, it produces a prism effect or soft rainbow.
When evaluating crystal glasses, notice the cut and stems, which will help your appraiser identify your stemware and its maker.
Identify the manufacturer of antique stemware by checking for a marker, which is typically on the bottom of the stem.
Stay alert for other historic crystal stemware makers such as Fostoria and Lenox.
Crystal is not just beautiful, but it sounds good, too.
The lower temperature required for making leaded crystal makes it easier for glassmakers to craft decorative configurations in crystal glasses such as intricate cuts and angles with sparkling refractions.
Overall, crystal has a smoother texture and is heavier than glass, but to positively determine if your crystal is authentic, seek input from a professional service.