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Glass is a solid liquid it flows very slow as if you ever had a very old piece of glass it will be thicker at the bottom than the top

it takes about 100 years to see a big difference in the glass thickness at the bottom

hope this helps

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11y ago
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12y ago

It can be hard to tell, but one thing about older glass items is that they have an irregular raised area on the bottom. This comes from being hand blown. Newer glass is made by machines.

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9y ago

dimples

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Q: How can you tell if a glass is old?
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