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Funny Magnetic substrate

Ha ha,
    I thought I would share with everyone an interesting discovery that I 
found out about my 'black beauty" (it is really pretty actually) black sand 
blasting grit. It's Metalliic! or at least has Iron, because it sticks quite 
well to algae cleaning magnes! Imagine the suprise when your substrate starts 
sticking to your magnets
Fairfax, VA
Discus Lecture at PVAS tonight! WHOO HOO :-)