1. The material quality should be pure: if the glass material is not pure, there will be lines, bubbles or sand on the glass drinkware. The rough lines can be felt by hand, but the fine lines can only be seen by facing the light. The material bubble lives in a relatively deep part of the vitreous body and looks like a small circle from the outside. The operating bubbles are relatively exposed, some are raised like fish eyes, and a light poking will pierce the holes; some are like small scars on fruits, which are easy to peel off layer by layer. “Sand” refers to the white granular silica sand embedded in the vitreous body without melting, and also refers to other granular impurities.
2. The thickness should be the same: when selecting, observe the drinking utensils against the light. If the light perception is the same everywhere, it means that the thickness is the same. From the outside, the bottom should be level, not sloped or pot-like; flicking the walls with your fingers should make a nice sound.
3. The appearance should be beautiful: that is, the surface should be smooth; the gloss of the bottle should be good; the geometric shape should be flat; the bottle cap should not be too loose or too tight, and the shape of the teapot and tea bottle should be coordinated.
