I heard that washing hands with cold water after practicing will result in arthritis.
Should be fine, so long as you don't wash them in hydrofluoric acid or some other lethal acid. But I doubt you had that in mind.
HAHA I just read that sometimes drums of hydroflouric acid are sometimes stolen by meth producers who mistake it for hydrochoric acid. Talk about an unpleasant and deadly surprise! Kids, don't do meth, it may kill you.