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**BrandonB** · Добавлено: Ср Апр 15, 2026 20:02 pm

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?

**vladimir_b** · Добавлено: Ср Апр 15, 2026 23:38 pm

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?

**BrandonB** · Добавлено: Чт Апр 16, 2026 00:57 am

It is the area where the denomination is, that brown rectangle

If you heat it with your finger the brown rectangle fades away and you see lots of little 500s revealed.

I first saw that on the Regula website, they show it with the 500 Latu. A friend of mine has a 100 Latu and he verified it happens with that note.

I bought a 20 Latu note from 2009. Although it has the same design with the rectangle behind the denomination, it is not thermochromic.

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