Step 1: What You Need:
1/4 cup (container)of Epsom Salts (Magnesium Sufate)
1/2 cup (container) of tap water
Shallow bowl or dish
Food Colouring (optional)
Sponge (optional)
Time (it took me three days, but it depends on sunlight)

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they also sell it at a good price
I WOULD like to see more pictures though, but this is still cool, hopefully I will try out this awesome Instructable.
+1 rating.
This would be much-improved if you did it again yourself and took your own photos. Use the macro function and plenty of illumination - at least a desk lamp, but you should read this first.