It has been on my mind. How to go beyond the obvious? Do I need to or can I just have fun? Ink that becomes invisible at certain temperatures or changes in light. To reveal what exactly? Something printed underneath, like a different pattern or image. So that would be like 2 t’s in one depending on conditions. A gimmick. NO? yes, no yes and no. Maybe.
I think that there is a spectrum between gimmick and fun, and resolving the gimmick element is always a challenge