One of the most popular collectibles is old glassware, but did you know most pieces manufactured before the late 1970s contain lead? If you’ve eaten off it occasionally, there’s no real reason to worry, but it’s best not to make it a habit. Also, this glassware should not be used in a microwave or dishwasher, as lead may leech out of it under high temperatures.
You can somewhat determine if your glassware does have lead. Leaded crystal glassware often has a higher weight compared to regular glass, produces a distinct ringing sound when tapped and may have a higher level of brilliance or sparkle. Colored glassware, particularly if it has a deep, vibrant hue, like the Fiestaware pictured, will also be more likely to contain lead.
Some old glassware is also coated with radionuclides — uranium, thorium, and potassium — used for coloring glazes, which emit alpha, beta and/or gamma radiation.