Black Iron Oxide - Fe3O4 - Synthetic - 1 Pound

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.

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.

Really was surprised at its consistency. Very fine particles but seem to "clump" and not flow out of its container. This maybe a characteristic of synthetic makeup. Purpose of purchase was to tint white powder to a grey shade but haven't tried that yet. It is probably a quality product that I am not familiar with yet. Time will tell.

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

Bought to make a Ferro-fluid jar and magnetic slime. Such fun projects! Just beware that if you're making ferro-fluid you will want to mix it in a container you don't need because you are essentially making printer ink and that stuff will stain like crazy.

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.

I bought this product to use with our cub scouts who were making slime. Wow! They absolutely fell in love with the fact that it "eats" their magnets. Definitely worth the purchase for any scouting, schooling or science experimenting person!

My daughter needed this for her school science project. The price was good. But be aware this stuff makes a mess. Not easy to get off skin or clothes. But other than that. It worked great. Was mailed fast.

I wanted to make some magnetic play doh. I found an easy playdoh recipe on google using 2 cups of all purpose flour, 3/4 cup of salt 4 teaspoons of cream of tartar and 2 cups of lukewarm water. I added a cup of the iron oxide and cooked it in a pot stirring until it became playdoh. Then I took some strong magnets to make the playdoh move around. Kids loved it. The iron oxide is black so the playdoh came out black and makes your hands dirty which is a downside. On the bright side my kid keeps leaving food in his room so I sprinkled some black playdoh near the walls and told him it’s mouse droppings. He stopped eating in his room, but also stopped sleeping there.

Black Iron Oxide or Fe3O4 can be a lot of fun to make magnetic compounds out of, from magnetic slime to ferrofluids and beyond (like Thermite), but the clean up is unreal. This is worth mentioning that these are nanoparticles in size so are basically as small as pollen and really should avoid inhaling it under any condition, it will go through a dust mask, so take care when handling it in its powder state. It also should go with a warning that this will stain basically everything it comes in contact with so be well prepared for a messy cleanup. The pictures attached are a basic ferromagnetic fluid that you can see how this powder reacts under a magnetic field when coated with a surfactant and suspended in different carrier fluids. Enjoy with care!

Like everyone else here, we made magnetic slime. Worked perfectly. Speedy delivery

J'ai acheté ce produit pour faire de la glue magnétique. Mis à part de tacher tout dans la maison et d'avoir les mains noires pendant 1 mois, ce produit ne fonctionne pas du tout pour la glue magnétique. Ce n'est qu'une couleur qui tache. Optez plutôt pour l'oxyde de fer naturel. Plus dispendieux mais fonctionne pour la glue magnétique et ne tache pas.