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

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

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	#283,773 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #255 in Inorganic Reagents
Brand Name	Alpha Chemicals
Container Type	Bag
Customer Reviews	4.5 4.5 out of 5 stars (1,095)
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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