The amazing liquid that reacts to magnets.

Videos

• 
• Ferrofluid is a liquid that responds to magnetic fields.
• Observe magnetic flux lines by placing a magnet close to the ferrofluid.
• 
  Watch video for: Ferrofluid in a Bottle
• 
  Video: Short Ferrofluid demo video.
• Ferrofluid in a Bottle — Mini (30 mL)
• Ferrofluid in a Bottle — Small (60 mL)
• Ferrofluid in a Bottle — Large (120 mL)

Mini (30 mL)

$29.99

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Item #5560

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Small (60 mL)

$37.99

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Item #3319

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Large (120 mL)

$57.99

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Item #3571

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Overview

Ferrofluid is the astonishing liquid that becomes highly magnetized in the presence of a magnetic field.

Comprised of nano-scale magnetic particles suspended in a transparent liquid, undisturbed ferrofluid forms into a smooth pool. But when a magnet is brought close, ferrofluid reacts in strange and fascinating ways.

With Ferrofluid in a Bottle, you can safely and easily play with this spectacular substance. Using the included neodymium magnet(s), you can spike, toss, drop, pull, and bridge the ferrofluid. You can even make it dance.

Made in the USA. Ages 18+ due to presence of magnets.

For people who like:

• fidgeting
• gifts for geeks
• gifts for the inner child
• made in the usa
• magnets
• office toys
• science

Features & specs

• Fluid reacts to included neodymium magnet
• Ages 18+
• Not a toy
• Made in the USA
• Small bottle: 1.25mL of ferrofluid + 1 magnet
• Large bottle: 5mL of ferrofluid + 1 magnet

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You've just got to see this stuff to believe it!

We made a short demo video (below) showing off a few of the things you can do with the fascinating magnetic fluid, ferrofluid.

The liquid is comprised of nano-sized magnetic particles that are suspended in a unique combination of solvents. In the presence of a strong magnet, the liquid becomes magnetized and generally behaves like some sort of alien creature. Science is awesome!

Ferrofluid is for fun / blowing your mind

A liquid magnet = hours of fun. You can spike it, toss it, drop it, stretch it, bridge it, and make it dance. It's basically a fidgeters dream come true.

Because ferrofluid can be messy and stains easily, the manufacturer smartly sealed it inside a bottle. Plus, its metal cap makes for a great place to store the included magnet when not in use. Simply put, Ferrofluid in a Bottle is the best way to experience the magic that is ferrofluid.

Ferrofluid is a liquid that responds to magnetic fields.

Those spikes are magnetic field lines!

Most of us have performed (or seen pictures of) the classic magnetic field experiment. You place a bar magnet underneath a piece of paper and then sprinkle iron filings on top. The filings arrange themselves in such a way as to approximate the magnetic flux lines.

Using Ferrofluid in a Bottle, you can see this phenomenon in real-time and in 3D! The stronger the magnet, the larger the spikes. And the closer the magnet is to the ferrofluid, the closer the spikes will be to each other.

Usage note: Leaving the magnet against the ferrofluid for extended periods of time can cause irreversible damage to your ferrofluid such as it no longer being able to spike. When not in use, keep the included magnet attached to the cap of the bottle or in a separate location.

Observe magnetic flux lines by placing a magnet close to the ferrofluid.

Choose from two size bottles

Ferrofluid in a Bottle is currently available in two sizes: small (60mL) and large (120mL).

Please note: There is 4 times as much ferrofluid in the large size than the small size.

Frequently Asked Questions

Question: How does this stuff work?

Answer: Magic! The magic of science, that is. Ferrofluid is created by immersing nanoscale particles of magnetite, hematite, or an iron-containing compound in a carrier fluid. Thus, this suspension contains both solid and liquid particles.

Question: Is this the same stuff you used in that awesome Talking Bottle Opener video?

Answer: Good eye! To create some of the "artsy" and cologne commerical-esque effects in the Hans Gretel Talking Bottle Opener video, we used ferrofluid.

Question: What ages is this for?

Answer: Ferrofluid in a Bottle is for ages 18+ due to the inclusion of neodymium magnets. Never ingest magnets or use them as fake facial jewelry. They can be extremely harmful if swallowed.

Question: You said that ferrofluid stains. How does the glass not stain?

Answer: The manufacturer uses a special blend of 14 different suspension liquids to prevent staining of the glass walls. If you were to open the bottle (it's not easy, but do not try!) and get some ferrofluid on your hands, it will stain. You will need to wash your hands repeatedly to remove it.

Question: Can you drink the fluid inside the bottle?

Answer: No. Ferrofluid in a Bottle is not a refreshment. Don't drink it.

Question: The suspension looks cloudy. What gives?

Answer: That means it's too cold. Allow the suspension to warm up to room temperature and it will clear up.

Question: Is ferrofluid just for awesome fidgeting? Does it have any practical uses?

Answer: Ferrofluid has many practical applications. It can be found in hard drives, MRI equipment, and optical filters. But, yeah, it's pretty awesome for fidgeting.

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