Glass Base

Can anyone tell me why all glass bottles have a series of raised dots around their base?
They seem to be different on different bottles but I don't know why...
I believe it's for stability, so when you set your bottle down, it has some type of grip or something so it won't slip or fall. Its just a guess. Most bottles now have the dots at the bottom.
How Glass Blowing Works : How to Blow Glass for Base & Missed Sections
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US $4.99







