Is green apple glass poisonous?

1. Good quality surface has few water ripples, especially near the bottom.

2. The bottom cuts are also much better, which is not obvious;

3. The top part burns evenly and the temperature is just right. If burnt, it will cause the top edge to turn outwards, like a horn;

4. If you handle a better cup and transfer it to the palm of your hand, the cup will be smoother and the bad cup will be uneven;

5. A cup with good color should be transparent, bubble-free and variegated. Yellow, blue and blue glass (unless the glass itself has to be made into a certain color) is not a good thing;

6. Knock on the cup, the sound is crisp and rich.