Pingpong balls are made of celluloid, which is a tough flammable thermoplastic made essentially of nitrocellulose nitrate and camphor. http://en.wikipedia.org/wiki/Celluloid ... It's highly flammable

Originally posted by Mr_TrekHydrogen gas bombs are cooler
Originally posted by LikeASong[..]
I can teach you how to build one (in a smaller scale of course). Not suitable for indoors though.
Originally posted by Mr_TrekHow did you prepare stearin/aceton?