Hi Dawn --
I'm afraid I don't know too much about metal casting -- however, I did learn something while I was student teaching... One of the kids wanted to pour lead (or maybe it was silver? I dunno, this was 25 years ago!) into a wet clay form. I said sure that sounds like it'd work. Well I guess it's good that my supervising teacher was hanging around since he stepped right in and advised me that if the molten metal was poured into wet clay it would explode. So! Don't do that! You guys all probably knew that already, though!
I took a jewelry class once and the instructor carved one of his molds out of the cuttle bone that you give to parakeets -- he was able to get some nice details that way.
Good luck -- your kids are gonna love it!
Liz in rural NY
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Subject: casting materials
Is there anyone out there who knows a lot about metal casting? I want to do a
basic metal casting unit with my eighth grade in the fall.