Thermo-Reactive Inks
Thermo-Reactive Inks
Out of context: Reply #3
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- rabattski0
cool stuff though.
i have this book from underware about their typeface called sauna. if you read it in the sauna some parts will become visible / readable due to the thermo reactive ink.
and they used this "passport" paper so it would dry up normally and not rot away.
luvly.