Glass mug identification method -one

The material should be pure: if the glass material is not pure, there will be lines, bubbles or sand on the glass drinking ware.

"Grain" refers to streaks on the surface of the glass body. Rough lines can be felt by hand, fine lines can only be seen by holding them up to the light.

"Bubble" refers to the small cavity formed in the body of the glass by wrapping the air. According to the formation reason, it can be divided into two kinds: material bubble and operating bubble. The bubbles are deep inside the glass and look like small circles from the outside. The operation bubble is more exposed, some such as fish eye bulge, a gentle poke will Pierce the hole; Some like the small scar on the fruit is also easy to peel off layers.

"Sand" refers to the white granular silica sand embedded in the glass body without melting, and also refers to other granular impurities. Sand is difficult to spot when embedded in a thick bottom or under the cover of a brushed coat. Because of the different composition of sand and glass, the expansion coefficient is different, so a little collision with the glass body off, resulting in glass cracking; Sometimes, although there is no collision, because of the temperature change, the sand will be detached from the glass, causing the glass to burst automatically.