Grow Red Crystals

Here are some easy instructions for growing naturally-red monoclinic crystals using potassium ferricyanide and water. Don't be too worried about the 'cyanide' part of the name -- the compound isn't edible, but neither is it especially toxic. Here's an MSDS, in case you need further convincing. Have fun!
How to Grow Great Crystals|Using MSDS Sheets