Silvers and dews are the same colour, silvers come in all shades, some darker some light, dews are the lightest shade of silver and usually have a few dark hairs on them somewhere. Most silvers get lighter the older they get , some pale silvers would be called dews after a couple of moults.
a dark eyed white is all white no sliver in it or dark hairs this is a sliver and def not a dew
I know thats a silver, they come a lot darker and a lot lighter than that, what I'm saying is the very lightest get called dews, when in actual fact the same gene is involved.