UV-printed text allows sheets to be reset and re-used 80 different times
This message will self-erase in five to more days.
Tag: Ink
One of the oldest known New Testament copies could have been written in pee-based ink
This ink is number 1. Literally.
Why getting a tattoo hurts — the science behind inking
Humans have tattooed themselves since times immemorial to celebrate gods, show social standing, for medicinal purposes or just to look ...