Wallet in trousers,
Trousers in washing machine:
Jeez, it's been years since I made that mistake! I'm not sure I've ever done it in China before. Chinese money is very absorbent. And it picks up colour - and, er, loses some of its own - rather easily. I don't know if I'm going to be able to use some of these notes now: a moment's inattention may have cost me some hundreds of renminbi.