What are the cutting methods of glass bottles

Glass bottles are packaging containers for food and beverages and many products,which are widely used.Glass is also a kind of packaging material with a very long history.So do you know how to cut glass bottles?
1,glass knife cutting method:cut a file mark with a glass knife,cotton line in the file mark around a few circles,drop alcohol,lit the cotton line for about a minute,and then drop a few drops of water,the glass bottle can be broken along the file mark.

2.Flame cutting method:Draw a line on the glass bottle,the flame is aligned with the line drawn on the glass bottle,rotate the bottle to heat the bottle evenly,and then immerse in cold water,repeat many times.

3,waste newspaper cutting method:cut into 5-7mm wide strip of waste newspaper,wet with water,close to the bottle wall around 1-4 circles.Light the alcohol lamp,align the cutting line of the glass bottle with the flame of the alcohol lamp,and keep turning the bottle.When the bottle is hot,put it into the cold water camel and disconnect it.