Chemical Garden - cooking recipe

Ingredients

6 Tbsp. each: liquid bluing, water and salt
1 Tbsp. ammonia
3 or 4 small rocks, clinkers or coal

Preparation

Mix bluing, water and salt.
Add ammonia.
Mix well and pour slowly over 3 or 4 small rocks, clinkers or coal in an old pie pan.
Crystals start to grow very soon and will continue as long as the liquid stays.
If you want a little color, add a few drops of food coloring to the rocks.
Set the pan where you can watch it daily.