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

₱3526

Duties & taxes included

In stock

Sold byAmazon PhilippinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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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	#39,703 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #28 in Inorganic Reagents
Brand	Alpha Chemicals
Brand Name	Alpha Chemicals
Container Type	Bag
Customer Reviews	4.5 out of 5 stars 1,097 Reviews
Item Form	Powder
Item Volume	1 liters
Item Weight	1.1 pounds
Manufacturer	DYUEOK
Model Number	C2I_INV_B008LEOMJC_R
Package Information	Bag
Part Number	1SynFe
UPC	725410978229
Unit Count	16 Ounce
Volume	1 liters

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