This is part of my thesis project using thermochromic pigment to silkscreen receipts. The use of the pigment is to portray an image of a subject on the back of the receipt, over narrative text. The idea is that when the image of the subject is touched, the image fades and a quote from their narrative is revealed underneath. This interaction allows one to have an immediate and subtle understanding of the subject encountered through the existing artifact (the receipt) collected everyday.
Instructables Link is here: http://www.instructables.com/id/Thermochromic-Imaging/