In 2007 the Dutch mint started with a pilot project that made it the first in Europe to print money using cotton for which the producers have not been exploited. So far, the 20 and 50 euro bills produced by De Nederlandsche Bank have contained 10 to 14% fair trade cotton.
Paper factories prefer blends of cotton, and according to the mint (PDF, Dutch) “currently there is not enough good fair trade cotton to make up 100% of a bill. But the fair trade cotton market is growing spectacularly.”
The use of fair trade cotton in Euro notes is the result of a bet that the youth chapter of Christian union CNV made in 2005 with the Minister of Finance at that time, Gerrit Zalm.
(Via the print version of De Zaak.)