This “Magnetic Field Paper” is simple enough, reacting to the mysterious power of the lodestone. I am unsure if baby’s blood is necessary to activate its fell power, but I figure it always pays to play it safe.
From the product page:
Developed back in the 1970s, with ideas that it might become a replacement for paper, this paper makes magnetic fields visible. Any other magnet can be used, and the paper will allow to to make the magnetic field visible.It consists of a thin plastic sheet containing tiny cells containing liquid. Each little cell contains colloidal iron. Hold a magnet near, and the iron in each of the cells will align, and form a pattern on the paper.
That would imply to me that it is reusable, sort of like a cross between an Etch-A-Sketch and those iron filling-filled mustache man magnet kits. It’s $11 for a three-by-three-inch square.
Catalog Page [Grand-Illusions.com via Coolest Gadgets]
Previously: Lancome “Le Magnetique”: Magnetic Nail Polish [BBG]
Yes, it is “reusable”.
If $11 seems steep, Edmund Scientific sells “Magnetic viewing paper” in 20mmx50mm pieces for two bucks each:
http://scientificsonline.com/product.asp_Q_pn_E_3082237
The larger and more expensive Grand Illusions “Magnetic Field Paper” in the article apparently constrains the iron within cells. I’m not sure how much difference this makes?
I seem to recall a similar item with which you could clearly see the magnetic domains making up the tracks and data on a credit card’s stripe, but I don’t know whether ES or GI’s products is sensitive enough to work for this?