4843 x 3593 px | 41 x 30,4 cm | 16,1 x 12 inches | 300dpi
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As early as 4000 BC glass was used in the Middle East as a glaze to decorate beads By 1550 BC coloured glass vessels were widespread and used for cooking and drinking The earliest known clear glass is a vase found in Nineveh in Assyria dating from around 800 BC which is now in the British Museum in London Until the 18th and 19th centuries glass was very expensive and was used for limited applications such as stained glass windows for churches Large scale glass manufacture began with the industrial revolution with the mass production of glass containers beginning at the onset of the 20th century and glass light bulb production automated in 1926 Nowadays glass is much less expensive and is taken for granted as a packaging material in addition to its use in windows and other applications New glass is made from a mixture of four main ingredients sand soda ash limestone and other additives These additives include iron for colour brown or green chromium and cobalt for colour green and blue respectively lead to alter the refractive index alumina for durability and boron to improve the thermal options Annually total glass use in the UK is estimated at around 3 6 million tonnes
