My tweezers ended up being magnetized about half way through clean up last night. Is this common? Anything I can do to De-magnetize them? They were not magnetaic when I started using them.

just hit/tap hard them on a metal surface untill it dont pickup particals anymore. dropping magnets onto a floor will also lessen its ability to be magnetic. no joke! anytime you rub use metal tools around any magnetic material, it will pickup small amounts of magnetics.

Thanks for the tip Russau, it worked. Makes it a lot easier to pick stuff up without all the black sand interferrence!