magnetic putty
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How To Make Your Own Magnetic Slime Using White Glue And Iron Filings
If you’re not sure the novelty of putty that reacts to magnets will hold your attention long enough to spend $US15 ($20) on a whole can of it, Dave Hax shows you how to make your own on the cheap using just Elmer’s white glue, some Borax (sodium borate) powder, and iron filings.