Black Iron Oxide - Fe3O4 - Natural - 5 Pounds

The media could not be loaded. Shipped fast. It’s a fine powder but it definitely weighs 5 lbs. you get a lot in the foil bag. You can reseal and zip the bag which is great for multi use. Be careful not to inhale the fine powder. Wear a mask. The color stains but washes off your hands easily. The magnetic property is strong and amazing. We made magnetic slime for our annual Halloween party. Worked great.

I normally wouldn’t leave a review for something like this. It is what it is. BUT, I wanted to comment on the excellent packaging. I’ve ordered this from other sites and there’s always a bit of a mess in the box. But this was as clean as clean can be. It’s even in a white bag and there’s absolutely nothing on the outside. Really great.

I mixed the entire 5 lb bag into 1 gallon of paint applied in 4 coats - testing between coats - the fourth coat did the trick. This covered a 4 x 8 ft plywood sheet. I like the option of picking my own paint color rather than the chalkboard or magnetic paints advertised. Remember that the black powder will darken and flatten any paint. Recommend mixing in smaller batches for each coat and using a drill stirring stick rather than mixing by hand.

all good....

Black Iron Oxide - Fe3O4 - Natural - 5 Pounds great for projects with magnets.

This superfine powder is perfect for making magnetic slime. It's a great value in the 5 lb. bag if you plan on making a lot of it. Do not confuse this with iron filings, which some online slime recipes use - this is a fine black iron oxide powder that will make slime that is magnetically reactive. I'm sure it has many other uses, but my last chemistry class was in high school.

Works great, fine particle size is exactly what I was hoping for. (Note: not great for making ferrofluid, particles are not fine enough)

It did not work for magnetic slime, but may be useful for other purposes.