4 oz (120 ml) Magnetic Ferrofluid Science Bottle – Interactive Liquid Magnet Display for Experiments, Demonstrations & STEM Projects

This is an awesome gift for anyone who enjoys science. I bought this for an experiment which it worked perfectly for, but I have ended up using the extra just to play with. It is incredibly interesting, and educational. All you need is a strong neodymium magnet, and a clear container to put it in. The only issue/problem that I have with it applies to any Ferrofluid, & that is that it is incredibly messy, so you need to either keep it contained, or put down some newspaper, and wear rubber gloves when using it. all things considered, the size of the bottle you get for the price & the overall fun and educational Experience Make it well worth the price.

Tons of fun and a good solution for projects.

Cool stuff but make sure you're covered in case you splash some out of the jar

The ferrofluid works great, exactly what I wanted. The only problem I had was that the bottle had a very narrow neck, which means that I have to either get a funnel to put it back or use a jar with a larger lid. Came in one piece and in a reasonable amount of time. I intend to use this to demonstrate magnetic fields with a neodymium magnet

Got this as a science tool/ fun experiment for my daughter, along with some strong magnets. It works ok, but the oil that the ferrous particles are suspended in is very dark and viscous, so it quickly paints whatever surface it contacts ( I used a glass jar) black and takes quite awhile to clear off.

First the bad, as others have noticed, this stains like mad and the container does not pour well. It also stinks to high heavens as well. But wow is it neat! I used a 1/2 inch neodymium magnet and put about 15-20 ml in a plastic food container. (Glad brand thin plastic resealable food container, like cheap thin tupperwear) Putting the magnet under the container produces immediate results. You can make the fluid flow uphill, and so much more. It is a rather expensive gag/novelty item, but very neat to play with..

I reviewed 1 star earlier and unfortunately i was making a mistake about water filled bottle. I didn’t know there was supposed to be a suspension liquid instead of just water, to prevent the bottle from getting dirty. With this solved, i can confirm this brand seems to be making a decent quality ferrofluid. My bad about the previous review.

THIS IS COOL IF YOU CAN RIG UP ELECTRICAL MAGNETS FROM ORDINARY & BIZZAR SHAPED OBJECTS WORK BEST FOR DISPLAYS. DRIES UP RATHER QUICKLY IF LEFT UNCOVERED, OPEN TO DRY WARM AIR CURRENTS: VIA HEATING DUCTS. SPLASHES EASILY, AND THE CLEAN UP IS BRUTAL. STAINS EVERYTHING DARK BLACKISH- USED MOTOR OIL COLOR, INCLUDING FINGERS. IF YOU HAVE NO SOURCE OF ELECTRICALLY MAGNETIZING RANDOM OBJECTS, THEN THIS STUFF GETS BORING FAST.