..
W10 Salt sugar, citric acid:  Can you make them invisible?

* Left: Train to press only one single water drop out of your syringe. * Hold the drop as close as possible to your eye. Oberserve: The world behind the drops is upwards down.
* Middle:  Transfer drops on a black plastic surface with some grains of salt, sugar, citric acid.
  (If you like you can also take some grains from inside a baby nappy and add drops of water).
* Right: Sugar and citric acid have disappeared in water, * a few residues remained from my sample of table salt. Nappy grains can take more than three drops of water forming a jelly.
Remember : The disappearing of sugar and citric acid in water is called dissolving.