Tom Trusky - Student Hectography
A bibliophile teacher has lead his classes through the process of making hectographs, a gelatin printing process, and has put the instructions for this on the web. Basic process is make smooth gelatin sheet, make an ink laden master, put master on gelatin allowing ink to seep in, remove, apply paper and get print. Fun.
dead link: http://english.boisestate.edu/ttrusky/hecto.html