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Quartz pebbles from the River Ticino, roasted and pulverised into silica, soda made in Syria from seaweed ash to lower the silica’s melting temperature, manganese from Piedmont for colourlessness and transparency – Prof. Rebecca Stott of East Anglia University tells the story of the Venetian glass prism used by Sir Isaac Newton to spilt a beam of light into the rainbow colours of the spectrum. Tickets £6 & £4.