Not really a skill question for your video, but what do you do with your steel or aluminum shavings from fabrication?
Where would I look in a medium sized city to find shavings of either of these metals for a science project? Locksmiths?
Discussion
I would contact a small machine shop in your area. They would have steel and aluminum chips from milling. Possibly smaller filings from grinding. In any shop the stuff is Everywhere. I hope this helps!