I made five palettes with thermochronic inks. I mixed Thermochromic powder or ink with acrylic base and demonstrated on paper. 4 of 5 worked well when I put my hand on them. Only one with blue ink didn’t work at all.
My inspiration came from here. http://www.amandakeenan.com/out-of-sight-out-of-mind-serie/
Poster series by Amanda Keenan has a meaningful message of environmental issues and she used thermochronic inks to give hidden messages to the public. After I saw her posters, I made a hidden message with thermochronic inks I created. Complex numbers like a mathematical formula will turn into a hidden message ‘I love you’ when temperature became higher.