Would this be a good choice for use with demonstrations of magnets and magnetic fields?

That depends on what you're trying to do. You won't be able to make a true ferrofluid (that is, a silky smooth, low viscosity, inky black fluid), but you can indeed make a more 'chunky' magnetic fluid. You'll need strong magnets.

Would this be a good choice for making ferrofluid?

In short, no! I was mislead by the first answer to this question and bought a bag to play with. The problem is particle size; ferrofluids require particles under about 10 nanometers and these are (claimed to be) 1 micron (1000 nanometers) in size. Far too large for ferrofluids, but I think I'll find something interesting to do with the stuff.

If made into putty or ink, is there a way to get this stuff to attract 'itself'? Ex: Spread the magnetized ink on 2 sheets of paper.

It seems to just lay there and do nothing on it's own. I made the putty (be sure to ware gloves when making it - it is OK to handle later) You have to have a really strong magnet to attract it - - it is a fun science lab for kids but the Fe3O4 is not magnetic it is attracted by a magnet. It can be really messy !

Is this suitable for making cosmetics? Cosmetic grade , if you will?

Yes. I actually saw a video where the woman had used for cosmetics. She did much research and found that it was suitable and safe for cosmetic purposes.

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Black Iron Oxide - Fe3O4 - Synthetic - 1 Pound

Product ID: 3686340

Details

Brand
Alpha
Item Form
Powder
Item Volume
1 liters
Item Weight
1.1 pounds
Package Information
Bag

🔒Resealable freshness & safety bag

🧲Fe3O4 magnetic power

⚙️0.30 micron ultra-fine particle size

$39.10

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Description

🧲 Unlock magnetic magic with every sprinkle!

TRUSTED QUALITY - Backed by 4.5-star reviews and top ranks in industrial reagents for professional reliability.
MAGNETIC MASTERY - Harness the power of synthetic Fe3O4 magnetite for next-level creative projects.
FRESHNESS SEALED IN - Resealable, safety-sealed packaging keeps your pigment pristine and ready to use.
VERSATILE INNOVATION - Perfect for magnetic putty, slime, welding, pigments, ceramics, and experimental breakthroughs.
PRECISION PARTICLE SIZE - Ultra-fine 0.30 micron powder ensures smooth mixing and flawless finishes.

Black Iron Oxide (Fe3O4) synthetic powder, finely milled to 0.30 microns, is a premium-grade pigment ideal for magnetic putty, slime, welding, ceramics, and scientific experiments. Packaged in a resealable, safety-sealed bag to maintain freshness and ease of use, this 1-pound container offers professional-grade quality trusted by thousands.

Specifications

ASIN	B008LEOMJC
Best Sellers Rank	#133,026 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #104 in Inorganic Reagents
Brand Name	Alpha Chemicals
Container Type	Bag
Customer Reviews	4.5 4.5 out of 5 stars (1,096)
Item Form	Powder
Item Weight	1.1 pounds
Manufacturer	DYUEOK
Model Number	C2I_INV_B008LEOMJC_R
Part Number	1SynFe
UPC	725410978229
Unit Count	16 Ounce
Volume	1 liters

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Very impressed with the quality and fast delivery. Will shop here again.

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The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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$39.10

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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