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Before purchasing any materials, make sure you understand the laws and regulations associated with explosives. These regulations range from the Federal level to more local jurisdictions. Make sure you are not performing something illegal in your area by doing your research.  Go to your state police department website to read up on explosives and fireworks laws local to your area. Some states allow fireworks, but have a set definition on what the term includes. If you aren't using legal fireworks in that state, you are committing a felony. It goes without saying that creating a bomb is dangerous. There are a number of precautions that must be taken for safety when handling explosives and explosive materials.  Have an emergency supply of water nearby for putting out any fires. Wear safety glasses. Explosives (including a match head tennis ball bomb) create sparks and debris that can injure your eyes. Use explosives outdoors only. Give yourself, and the explosive, plenty of room to operate. Do not throw explosives at other people or animals. Fire risk is determined by the surroundings of where you set of the explosive. Strong winds or dry weather also further increase the risk of a spreading fire – explosives should not be detonated during such weather.  Do not set off the explosive near homes, sheds or other structures. Look for a site that is at least fifteen feet away from shrubs, trees or other flammable plant life. Detonate the bomb over dirt or gravel if possible. The explosion site should be surrounded by dirt and gravel for 10 feet in all directions. Once the bomb has exploded, travel to the detonation site to ensure embers are extinguished. Use water if necessary to put out kindling and cover with dirt and gravel to smother the remnants.
Acknowledge the law. Read up on fireworks, explosives, and fire safety. Find an area near you that minimizes the potential for fire.