Offset printing.
There are plenty of examples of offset printing, not only for Qatar, but also most of the regional states. This is due to the changes in currency that most of the regional states underwent requiring plenty of overprints.
But what causes an offset print?
The general perceived theory is that a sheet is placed onto another recently (still wet) sheet and the ink is therebytransfered. But here is a different view, which I believe makes more sense.
Please share your opinion as to which is your favourite theory.
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