zlacker

Actually I tried to use it just for fun on some vouchers, but it didn't work on the copy machines I tried. They just happily photocopied the vouchers.

>>ale42+(OP)
Tried the same, doesn't do anything on my scanner. Interestingly, there are regions of banknotes my scanner refuses to scan. But had no time to investigate further.

>>krater+i5
Some more tests on this old page: https://murdoch.is/projects/currency/ (2004)