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Fo 16a Only the milky layer of "Du darfst" conducts electricity well.

Materials are the same like in experiment W 8. (take a needle instead of the pencil).
* Observations left:: The LED shows only a week light
* Middle: A bright light can be seen if you repeat the experiment with the milky layer
* Right : Most of the ingredients of "Du darfsr" are water, 0,5 % are table salt.
Explanation: DThe salt dissolved in water is responsible for the electric conductivity.
  The gelatine transforms water into a milky gelee.  The yellow far forms the upper layer.