Growing your own pure copper crystals is very easy. You only need the following: -A suitable container (flat walls are better, you can observe the growth better!) -Copper Sulfate. -A power supply. 5 volts or less is best! You can even do this with a few batteries in parallel! HAVING PROBLEMS? see below. I got my power supply at a computer store, it was from an old computer and cost $1. I used 3.3v. If your having trouble, try decreasing the concentration of the solution, this reduces the amps