Ferrofluid Magnetic Display 15ml Glass Bottle

this stuff was cool. it helps me when i drink lots of beer, i use it as a tool to see how drunk i am. it does not come with a magnet. it takes lots of fine tuned skill to operate this item. the stronger the magnet the more fun it is. good thing the bottle comes sealed with plastic over the cap because i might have tried to drink it and place the magnet on my belly to see if i can tickle the inside of my belly with it.

I had a lot of fun with this and so did kids until the magnet came out of the plastic holder. They should use better glue.

Super interesting to watch and manipulate.

I can't stop playing with this stupid stuff. The behavior of the fluid is so strange. Works great with magnets in old hard drives. Watch what kids do with it. They always do things that I don't even consider, like shaking it up.

hardly any ferrofluid in the bottle.

Very cool - works great, good clarity, etc. I wish it had shipped with a material safety data sheet so that I knew how to store it and who to let play with it.

Very cool. Just would have been nice if it came with a magnet to use with it.

Really cool and beautiful. Just one issue: if you leave a magnet on it for a while, the side of the glass can be permanently stained (though it's possible to reduce and sometimes fix the staining by running the magnet back and forth over the area for a while...but in my case some of it is still permanent).