Sändes fredag 7/2,
06:00 - 06:55på BBC Earth
Inside the Factory
Säsong 4: PencilsGregg Wallace is in Germany, at a historic factory which produces 600,000 pencils a day. At materials intake he is astonished that the main material in a pencil is not lead, but graphite. He helps mix this with clay to produce a 250-kilo batch, enough for 200,000 pencils.
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- 2019-03-19
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