the alternative way to repaint old building......

A bomb is an explosive device that generates and releases its energy very rapidly. The explosion creates a violent, destructive shock wave. Bombs cause destruction and injury to objects and living things within the blast radius by the crushing action of the shockwave (pressure) and by mechanical impact of fragments, including shards of the bomb casing (often called "shrapnel") or objects from the surrounding area propelled by the blast. Also, bombs have been known to kill by the sound of the blast, by the sound waves causing pressure on the body in such a way that may wound and/or kill a human. Bombs have been used for centuries in both conventional and unconventional warfare. Most bombs do not contain more energy than ordinary fuel, except in the case of a nuclear weapon.