How pencils are made?

This film shows how pencils are made from graphite, clay and wood at the production site of Faber-Castell.

Answer these questions: 

• Who spoke well of pencils 120 years ago?
• What mineral is used in the pencil leads?
• How do we made pencils with different hardness?
• Why do we bake the leads?
• Talking about pencils, what is a sandwitch?