I know of only two notes that have thermochromic ink: the 100 Latu (2007) and 500 Latu (2008) banknotes of Latvia, pre-Euro.
Thermochromic means they have one area that changes colour with heat. Just the warmth of your finger will do it.
These are the notes:
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Both of those notes are very expensive, especially if you want it in UNC which is probably what is required to demonstrate the thermochromic effect.
I want to know what other notes have this effect. I would like to get a note that is affordable for my collection. Does anyone know of such a note?
Which elements of these banknotes were made using thermochromic ink? The point is, such ink itself isn't particularly expensive, and perhaps it was used throughout the entire series?
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