I came across this article today and really found it amazing! Interactive Ink!!!!
I guess I have seen the technology with the Thermochromic ink on beer cans, but it didn’t register with me that the technology was in the ink. Also, I’m new to graphic design, so I probably wasn’t actually paying attention to how it worked.
Gillian Garside of Sun Branding Solutions has does a great job in explaining interactive inks and how they may be implemented in design.