Why are some colors more “bubbly” than others? (i.e. slyme vs sublime)
This is due to the minerals that are added to the glass to get the color. Sometimes the minerals just keep boiling causing the air bubbles.
We also think this happens as the color companies may be in a rush to find new colors as, after time, the colors start to lose the bubbles when purchased from the manufacturer.
Round bubbles will not affect the quality of the glass. Sometimes bubbles are added to the glass for the look. As long as the bubble is round and has no acute angles, all is good.