Build your own salt crystal

What do you need:
• 1 liter of water
• 400 grams salt

Start with boiling 1 liter of water, dissolve 400 grams of salt in this.
Stir well and be patient! Pour the solution in the container as soon as the salt has been dissolved. Put your figure in the container
Tip: use a coloring material to give your crystal a nice color.

Start with setting up al you need. Take care of a container to put the salt solution in and make a nice figure, for instance from rope. You could also use something different as textile. Make sure the water can easily pull in, otherwise you get no crystals. With little sticks or stainless steel wire you can make your figure extra firm.

If you have made your figure this way, and the salt solution is ready, you put the figure in the container with the salt solution. If it’s okay, your figure now starts to suck up the water. Make sure everything stands firm, so it cannot fall over. When you are ready, you put everything on a warm spot, for instance in front of the window in the sun. This way you make sure the water can quickly evaporate. It might take long before you can see the crystals grow: sometimes it takes two to three weeks. Therefore you need a little patience. But more often you see the first crystals grow after a couple of days. They will grow faster on a warm spot.

Salt crystal contest
One of the educational programs is the Salt Express, a large bus that visits schools in the Netherlands. Children learn everything about salt, and then have to do their own experiments in the bus, that is build into a small salt laboratory. In the weeks before the bus visits the schools, all children participate in the salt crystal grow competition. Children are challenged to grow their own salt crystal, and have to report about the growth of their crystal on a regular basis via the salt crystal website. It takes a few weeks to grow the crystal. When the bus has visited the last school in the region, the winner of that region is choosen by a jury of AkzoNobel and the University of Groningen and awarded in style.