|Time:||approx. 15 minutes|
|Recommended age:||from 8|
|Size of group:||it doesn't matter|
|Time for preparation:||time consuming|
|Material:||oil, leaves, charcoal and earth|
At this station oil, leaves, charcoal and earth is provided. With the help of two smooth or flat stones, the group must produce different colour tones by rubbing.
How many different tones are produced.
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