Swirls In Old Black Glass Bottles

DJV

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Anyone have an idea as to how the pictured swirls are created?
 

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From being buried in the ground for alot of years, I dug alot of bottles in the past that had swirling in the glass. Minerals, moisture make what bottle diggers call sick glass!
 
From being buried in the ground for alot of years, I dug alot of bottles in the past that had swirling in the glass. Minerals, moisture make what bottle diggers call sick glass!
Okay, so being underwater might have the same effect - thanks!
 

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