This post talks about the manufacturing of glass. First, glass is made from a bunch of different things. Silicon, lime, aluminum oxide, magnesium oxide and sodium carbonate are required in the manufacturing of glass; so sand, flint, limestone, soda (which is sodium carbonate), gold, nickel and other things are added in the combination process. The method for making flat glass is called the float glass process.
The float glass process involves having a large furnace that mixes all the materials (listed above) together into an oven that heats up to 1600 degrees Celsius. In order to colour the glass, different metals are added to the batch. Iron makes green. Manganese shows purple. There’s a lot more that are shown in this website: http://www.tynant.com/main.aspx?pID=39-0
The heated up mixture is placed into a tin bath (a tub of molten tin) in order to make sure that the glass can be seen through and to make sure that the glass is nice and smooth. The glass from the tin bath is removed with some rollers. The speed of the rollers will determine the thickness of the glass. After all of that, the glass is cooled, cut and then sent for manufacturing.
There’s another way of forming glass called the glassblowing method, which is used to make vases and/or bottles and many other things. It involves blowing into molten glass with a long tube to make a bubble-like shape. Some glass bottles are still made using this method; however a lot of them are mass produced using machinery sending compressed air into the bottles instead of someone blowing through them. Some bottles are plainly carved from a piece of glass.