EFH1 Ferrofluid 20ml for Science, Education, Experiments, Students, and Teachers

The fluid comes with two small screwtop plastic containers, along with a standard plastic petri dish and pipette. For the best effect I would advise putting a small amount in the petri dish, barely enough to cover the surface, and approach with a magnet from below. Be very careful, as a strong magnet from the side can easily cause the fluid to fly over the edge out of the petri dish!Be extra careful, since the fluid stains most materials, and can be difficult to wash out.The effect from a magnet is very interesting to look at. The volumes required are very small so this amount could be used to amuse quite a few people.

OK, top tips: open up the packaging throw away the plastic dishes and the pipette. Get your self a small, glass jar with a tight screw on lid, like an old small chutney jar and pour in the fluid, let it drain, wrap up the old packaging and throw it all away. Seal the jar with the lid.Now you can safely play with a magnet on the outside of the glass jar and you won't get this everywhere (like I did!). Its a good laugh and amazed our granddaughter and others.

Bought this for my science keen 7 year old. He loves it! But it DEFINITELY needs supervision, it's messy!! I learned that the hard way..

In first years it was great (5 stars). After 2 years not used and 2 years in a closed container for student demonstration it became solid and it is not responding to magnets (1 star). I contacted FIRST4MAGNETS and will let you know.

Great fun, just make sure you buy a neodymium magnet (a small one ~ 2cmx1cm will do) as this gets the best results due to the stronger magnetic field. Can play with making shapes in the petri dish or put the ferrofluid in water (videos online) and see what happens then. Loads of opportunities to have fun with physics, just make sure to keep it in the containers as it stains everything.

It's good

Does not really seem like a fluid more like very small filings. Dissolves into brown mess in bottle.

Fine

Alles bestens und gerne wieder !

It’s really fun but to to expensive for what your getting and it also is extremely hard to clean I still have stains on my table but if you will buy it please be careful and don’t let it get all over your face like I did.

Todo correcto, viene un bote de 20mL, unos guantes de latez, una pipeta de plástico y un recipiente con tapa donde echar el producto. Responde al magnetismo de un imán muy bien, pero tiene que ser algo potente.

Overpriced. As a toy, they do their job.

This stuff is so awesome. It took a couple tries to get a suspension fluid that worked, but when it did it was pure magic. For anyone wondering, I bought a square shaped vinegar bottle, and rinsed with with distilled water. I filled the bottle with distilled water and added kosher salt until the salt no longer dissolved. I dumped some out and added distilled water to get the last of the salt dissolved. I let that sit for a day, and then added the ferrofluid with a pipette an inch below the surface of the mixture and used a strong 1" cube rare earth magnet to pull the ferrofluid to the side of the glass. The salt water makes the ferrofluid want to dance and float everywhere so the magnet helps to grab it as it comes out of the pipette. I wiped any excess off the top with a paper towel and then topped off with the same saturated salt solution. That was pretty much it! Good luck!P.S. If it does stick to the glass the ferrofluid isn't wasted. Simply hold it in place at the bottom with a magnet and dump out the container. I did a couple distilled water rinses while holding the ferrofluid in place and then used a new pipette to transfer it to the next container.