Are paintballs harmful?
The shell of a paintball is made of gelatin, and the filling is made up of non-toxic, water-soluble ingredients. All ingredients are biodegradable. See how paintballs are made http://video.google.com/videoplay?docid=6864066340713942400 (by the Discovery Channel) There are other paintball videos on the same page, please keep in mind, some people do some very stupid things. These videos also show why you should be playing at a field instead of the backyard.
