Keeping Cullet Clean
Crushed glass that is ready to be recycled is called cullet.
Glass factories must be very careful about the quality of the cullet
they use to make new glass. If any metal gets mixed in with the molten
glass, the new glass will break easily. Also, metal in the glass furnace
can cause a lot of damage.
The colour of glass cannot be removed by heating in the furnace. That's why colour separation is
important. If cullet colours are mixed and recycled together, the new glass would all look the
same colour - brownish green!
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