Pink legs will not turn dark, at that age the leg color you have is the leg color you have. I would be suspicious that it is a mix as well, I bred Hamburgs for a few years in the mid 90's and never saw anything remotely close to pink legs.Thanks flower I've visited this site, but I have not found if a chick could have pink legs and turn dark later. This chick his not suposed to be mixed with another breed.