Fascinating. I wasn't aware of this, so I had to look it up. Apparently even the Deutsche Mark (which preceded the Euro in Germany) was made from "cotton paper"

Fascinating. I wasn't aware of this, so I had to look it up. Apparently even the Deutsche Mark (which preceded the Euro in Germany) was made from "cotton paper" (i.e. 100% cotton fibres). American banknotes are apparently made from 75% cotton and 25% linen. I'm not sure how the different banknotes internationally and across history stack up in terms of durability but the newer Euro notes (the 5, 10 and 20 notes introduced in 2013, 2014 and 2015 respectively) are supposedly more durable than the older ones.