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What you need
A two-pan scale made in Cairo, weights: metal closures of  Liquemin bottles, a German 1-Pfennig coin.
Experiment
Left: In ancient Egypt scales were already used 4400 years ago to weigh gold. The left pan contains this precious metal, stone weights are on the right pan.
Middle: In these new Egyptian scales metal closures of Liquemin bottles are used as weight.
           A German 1-Pfennig coin is on the left pan. The girls put the number of weights on the right pan which is needed to balance the scale.
Right: This boy has a little bid too much weight on one pan: The scale is approximately balanced.
Observation
A German 1-Pfennig coin (2.0 g) is balanced by 10 Liquemin closure weights.