The simple and directly ways to distinguish the quality of glassware.
For the layman of glassware, you just need to see the color of glass body to distinguish the quality.
1)Normal glass material
If the glass looks a little black and not clear enough, that is normal quality.
2)White material quality
White material glass is a little more better than normal glass.and looks more clear
3)High white glass material
High white glass is more better than white glass, and looks very transparent.The price will be more expensive.
4)Super white glass material
Super white is the most higher level of glassware. The quality is very goods, The glass looks very clear and shining.
Here are some comparison picture for your reference.