We are always thinking how we can do science at home and one day Elsa asked if we could make crystals. So…. we popped to our local library and found a at home science book which had it in.
It looked too easy to be true as you only needed 5 things (eggs, water, alum powder, pva glue and food colouring). First of all we emptied the egg shell of the eggs (we made cupcakes), then washed them and left them to dry.
Then we painted a little PVA glue to the inside of the shell and sprinkled it with alum powder, then again we had to wait for them to dry.
We mixed up 2 parts warm water to 1 part alum powder and then added different food colouring. We stirred it for what seemed forever until it had all disolved.
We put the eggshells into the different mixtures overnight. The next day we removed them and placed them on paper towels to dry out.
These were the results. They worked pretty well.