Black Iron Oxide - Fe3O4 - Synthetic - 1 Pound

Comes in a re-sealable bag as everything from this company does. I like ordering from these guys, they always deliver on time and their stuff always works.Used this to make some magnetic putty and it turned out great, swallowed those magnets like alien goo. Keep in mind if you will be using this for the same thing the putty doesn't keep. The humidity build up in the jar causes the metal powder to rust.

Very messy but that cannot be helped, it’s just a characteristic of the product. Does its job.

Got this for a school science project, and it came exactly as in the product description and photo. We’d ordered two packages, and they came double sealed. What’s more, the individual packages have a resealable zip, so that makes storage within uses that much more convenient, safe and reliable.The particle size is not quite nanometer size, but then that too was mentioned clearly in the product description, and we knew that beforehand. So, no complaints there.Oh, and it was delivered earlier than promised! A pleasant surprise.

Much like other reviews I used this product to make magnetic slime with my sisters. It worked great and a few tips I would give if you also plan on using this to make magnetic slime.A little bit goes a long wayI would recommend using neodymium magnets as they are very strongIt was easier to make when we added the iron to the glue before adding boraxMake the slime on a surface that is okay to stain if accidents happenIf the iron is not mixed in well enough or there is too much it will turn your hands and surfaces black.I found clean up to be the easiest with paper towels because it will smear if too much iron gets on the towelOverall it worked great and my sisters had fun playing with the magnetic slime.

Great for making magnetic slime. Very popular with my middle school students! Tip: for making slime, you need to use quite a lot. Make your slime base very sticky and loose because this stuff will tighten the slime significantly. Buy yourself a rare earth magnet. Normal magnets won't be strong enough to give you the effects you are looking for.

If you making magnetic this/that/the other, should work. If your making conductive paint, try graphite powder.

this product will stain things, so be careful - but for what it is the purity and particle size is exactly as described, about one year later, and half a bag used - and the product is still stable and viable! would recommend!

I used this to make magnetic slime for my science class and it worked really well! It mixed well and made a very dark slime that moves towards magnets.Warning: this powder is super fine so it is messy and gets everywhere.