We used common ingredients which could be easily found around the house.
A sponge, a lot of salt, and a beaker of preferably boiling water. Otherwise, very hot water will do as well.
C mixed in the salt and stirred till they are dissolved. Then she added white vinegar into the mixture.
Because the water was extremely hot, I had to help her pour the mixture onto the sponge. Do remember to place the sponge on a tray of some sort so that the water does not spill. Then we put the entire tray out under the sun. Crystals should start forming... .
You can add colours into the water so that the crystals that form will be tinted. :) This was what we saw after 2 days.
We didn't throw the rest of the mixture away and continued to soak the sponge.
See... a lot more crystals have formed! "They look like ice!" C exclaimed, except that they don't melt. :)
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