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The History of Glass

Early humans used a material called 1 to make the sharp points of their 2
4000 BC: 3 made of stone were covered in a coating of man-made glass.
First century BC: glass was coloured because of the 4 in the material.
Until 476 AD: Only the 5 knew how to make glass.
From 10th century: Venetians became famous for making bottles out of glass.
17th century: George Ravenscroft developed a process using 6 to avoid the occurrence of 7 in blown glass.
Mid-19th century: British glass production developed after changes to laws concerning 8