Inside Nikon's Hikari Glass factory
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Inside Nikon's Hikari Glass factory

As the glass continues to drain, eventually the water that it's draining into becomes so hot that it starts to boil.

The remainder of the heated glass is drained into the tank, and once everything is cooled down, workers will assess whether or not the crucible in the furnace can be used again, or needs to be retired. In the old days, glass used to be melted in clay crucibles, and for every 2,500 kilos of glass, only about 500 kilos was usable. The modern method is far less wasteful.

A small water jet to the right of the stream of molten glass helps break the stream up into small droplets which cool to form what are called 'frit'.