My hands keep changing colour. They go from a healthy pink to a dingy grey. I was ready to put it down to old age (well, perhaps middle age) the first time I saw it. Then I realised what was happening. My new, nicely trendy, black jeans were dropping some of their colour onto my hands each time put my hands in my pockets.
The other snag with trendy black jeans is that you wash them once and they turn instantly into streaky grey ones. But hopefully they’ll keep my hands cleaner.