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Watch Inside the Factory Season 4 Episode 8 Online

  • 7.75/10
  • COUNTRIES: United Kingdom
  • Subtitles: English

Gregg Wallace is in Germany at a historic pencil factory where they produce 600,000 writing implements a day. Cherry Healey examines the astonishing properties of graphite. Historian Ruth Goodman traces the origin of pencils to a 15th-century graphite discovery in the Borrowdale valley.