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by MartijnHols 416 days ago
One thing to consider is that if you were to succeed in placing hidden text/image on an ID card, it may fail manual forgery checks at airports and police stations. One of the many ways IDs are checked is with different types of lighting[1]. This might have made this stand out as an artifact, which could result in an officer doubting its legitimacy.

[1] https://www.airport-suppliers.com/supplier-press-release/the...