I was out in the country and picked me up some Prickly Pear cactus. How do you prepare it to get it to the stage to cast? I looked for the procedure I saw online once but didnt find it again.
I am the guy that came up with the idea of using prickly pear cactus for pen blanks and wrote the tutorial you are asking about. Send me a private message if you are interested in getting a copy.