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 Seal

🧲Fe3O4 Magnetic Power

⚛️0.30 Micron Ultra-Fine Particles

RM146

Duties & taxes included

In stock

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Description

🧲 Unlock Magnetic Magic with Every Grain!

PRECISION PARTICLE SIZE - Ultra-fine 0.30 micron powder ensures smooth mixing and superior performance in pigments and ceramics.
SAFETY MEETS CONVENIENCE - Resealable, double-sealed packaging keeps your powder fresh and secure for repeated use.
VERSATILE INDUSTRIAL GRADE - Perfect for welding, pigments, ceramics, and innovative scientific experiments.
MAGNETIC MASTERY IN YOUR HANDS - Harness the power of synthetic magnetite for next-level magnetic putty and slime creations.
TRUSTED QUALITY FAST DELIVERY - Highly rated for reliability and prompt shipping, making your projects stress-free and on time.

Black Iron Oxide (Fe3O4) synthetic powder, finely milled to 0.30 microns, is a versatile industrial-grade pigment and magnetic material. Packaged in a resealable, double-sealed bag for freshness and safety, it’s ideal for crafting magnetic putty, pigments, ceramics, and scientific experiments. Trusted for quality and timely delivery, it’s a must-have for professionals and hobbyists alike.

Specifications

ASIN	B008LEOMJC
Best Sellers Rank	#253,021 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #223 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	16.0 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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