One of the newer products we have in the shop is the Crazy Aaron's Thinking Putty in the 4 inch tins. We have had the magnetic putty for awhile but just recently delved into the "phantom" putty that is UV reactive.
We tend to have demos out for new stuff so we opened one of the UV reactive putty. It quickly became an obsession for us! The UV light that comes with it changes the putty from a light blue/grey to a dark turquoise colour instantly. You can draw on it and when you take it outside it completely changes to the darker blue.
I brought a tin home and my kids LOVE it! My 14 year old was packing it around the house drawing on it and was so into playing with the putty she actually paid more attention to it than her iphone (that NEVER happens!).
We have a video on the website also under the "About Us" tab and it shows how it works plus we posted a video we made in the store on our Facebook page May 4th showing the UV light in action.
I have to add too that this putty has an excellent story too. Crazy Aaron's Thinking Putty is all made in the USA by people with developmental and intellectual challenges. It is so wonderful to be able to support a great company like that!