Bests & Worsts Reviews from Amazon

I bought this because I am a hard-core science geek and I have a lot of very powerful magnets to play with. The product works exactly as described except for the long-span reaction, which is supposed to be a fluid-type reaction where it smoothes out and looks like a little droplet. It never really smoothes out, even after a week the quarter-sized glob I was testing held ridges and my fingerprint, although it did spread out pretty well. (That whole issue may be due to the added magnetic properties, which can reduce the liquid reaction state.) I just want to warn everyone who is thinking about this product for a small child: it s very cool, great way to learn about magnetism and hexotropic substances (latter for older students, obviously) the way that it is made magnetic is by suspending ferrous particles in the putty. These stay in the putty fairly well. (no detectible magnetic reaction reduction after 3 weeks of 3-4 hours/day being magnetized and demagnetized repeatedly) HOWEVER... They can, and DO, come out. Even if you play with it for a few seconds, I recommend passing the included magnet over your fingers and hands and washing well because they HURT BAD when you get one in your eye. I learned this lesson the hard way and just wanted to let parents, teachers, nerds, geeks, and all the other people who might touch this stuff so that they can avoid it.