Just a little trivia about me. I worked at Generra Sportswear up until they came out with Hypercolor (which I believe was their demise). I quit before the company closed, and Hypercolor was just in the development stage - that exciting stage. I wasn't there to see any problems with it, so I will always have very fond memories of heat-activated, color-changing apparel.
And here's a YouTube commercial for Hypercolor, just in case you want to relieve the early 90's:
I stumbled upon these links - and you know I'm DYING to buy some, but where to start?