I have a lot of LEGO Sets and have noticed that some of them have yellow hands and some have a dark grey colour hands. Is this because some are of old design and some are of new design? Most old ones have yellow hands, though?
This minifig has yellow hands:
And this one has grey:
http://vignette1.wikia.nocookie.net/lego/images/3/33/Cty027a.JPEG/revision/latest?cb=20101207021037