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 Bill Fairfax, VA Discus Lecture at PVAS tonight! WHOO HOO :-)