#N/D Metal Gallium Liquid Metal High-purity Low-melting-point Alloy For Scientific Research Metal Gallium 30-degree Melting Point

As described.

Absolutely brilliant my eight-year-old son loves it best thing I’ve brought in ages

I think this is galinstan (gallium-indium-tin alloy), because it is liquid at 20 degrees centigrade, whereas pure gallium is solid at room temperature and melts at about 30 degrees centigrade. The product is listed as 'liquid' and 'alloy' (both true, I think), but photographs and description suggest that it should be possible to pour it into the little moulds provided and pull out a solid cast. With gallium, you could do this by melting it at 30 degrees, pouring it in the mould and then letting it cool back to room temperature. This isn't possible with the product - it's liquid at room temperature! If it is galinstan, as I suspect, it will freeze at minus 19 degrees centrigrade, so you will need to put it in a freezer to get the little solid man in the photo! From what I've read, you should be able to do some of the cool things you see on Youtube where you amalgamate gallium with other metals to change their crystal structure, but you can't hold it in your hand as a solid lump (despite the photos), unless you're somewhere very cold. You could use it to make a thermometer, though. I'm giving this only one star for misleading advertising.

One reviewer mentions giving this to a child. Not a good idea. Although non toxic on its own, it can produce highly toxic compounds if swallowed, resulting in a very unpleasant death. Aside from that, it can totally destroy many things around your home as it combines easily with other metals - pour a tiny bit on an iPad or a MacBook and you’ll totally screw it for good. Other than that, safe to play with if you understand what not to do with it