Potassium chlorate should be handled with care. It reacts vigorously and in some cases spontaneously when mixed with many combustible materials. It is used in some traditional recipes for gunpowder, some of which are unstable. When mixed with some materials it forms a high explosive.
KClO3-sugar.gif Image:KClO3-sugar.gif
Burning sugar with KClO3.
A description how to make it is available [here (http://home.wanadoo.nl/erny8/KClO3/)].
Don't try this unless you are an experienced chemist!