Today we learned how to calculate the weight of raw materials needed for a batch of glass and the percentage of metal oxides – sand (silica) being, of course the central ingredient with other compounds (e.g. lead, soda ash, borosilicate, etc) varying the consistency and brightness. I found this strangely compelling, though the chances of my needing to do it myself are slim. At £600 a ton of molten glass, I am unlikely to need to make up a batch. Took me back to chemistry at school.
picture shows float batch from Siemens website
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