I followed chromic's method.
I bought some of the OTC rootkiller stuff, which was copper sulfate pentahydrate, they were a nice light blue color. I made a saturated solution of this in distilled water in a beaker.
In a second beaker, I made a saturated solution of sodium bicarbonate (baking soda). I then slowly dripped in the Sodium Bicarb solution, and there was a white precipitate, DON'T SHAKE/SWIRL the beaker w/ the precipitate. I added the sodium bicarb solution till the beaker was thick with precipitate then vacuum filtered to obtain fine white powder.
I dried this, then put it in another beaker and added 35% HCl, which bubbled, i kept adding HCl until bubbling stopped, and ended up with a nice green liquid, which I dried on low heat on my hotplate. I ended up with pretty green crystals, which turn brown(anyhdrous) if you heat them longer. They also turn a pretty turquoise (bluegreen) color if you let them sit out and soak up water.
Let me know if you have any questions!
-blaaky
If you want divine justice, die.