Thank you so much for your helpful reply!Thank you!
I had a little recessive white girl I hatched that was really hard to tell from a buff too. I suspect she was probably gold based, maybe your little white girl is as well. She still might be silver based and the one copy of silver just doesn't shine through though.
The ground color is sex linked but I don't really know that it'll be obvious which one has which ground color at hatch. Maybe I shouldn't have called it sex linked but rather just said the father determines the ground color in girls. I just really like the bright white of the silver gene so thought it would be nice to know your females would all have that with your silver gene boy as the father. I am really interested to see if the females hatched do actually express the smokey color in yours like they do in mine though!
If your white girl is gold based the male offspring would carry both silver and gold (I've seen it called golden before). I'm not sure how the down would look in these. I think the silver tends to be more dominant than the gold in golden males but it's still a bit different looking than a silver/silver male in colors where ground color is more obvious (like partridge).
As far as what you might get with your silver gene white boy over the partridge girl it is a bit hard to say. Recessive white is really good at hiding other colors. That being said I've heard a lot of recessive whites are partridge under the white. If your silver gene boy is like a lot of recessive whites and carries partridge than you could get partridge offspring from the pair. They will all carry a recessive white gene from dad and if bred back to a recessive white would produce 50% recessive white offspring.
If your boy is partridge under the white you should get silver partridge females and golden partridge males from the pairing. It sounds like your partridge girl may also be blue rather than black so you might also get 50% that have the lighter blue underfluff if that is the case.
If you try out the white/partridge pairing what offspring you do get hopefully will help to figure out what color dad is underneath the white.
I'm definitely not one to judge when it comes to mixing colors. I know some breeders really discourage it but I don't have anything against it as long as someone is upfront about their chicks coming from a mixed color pen when selling. I myself am trying to breed my paints to standard but I also really like the calico look of some color combos and I'll be doing that as a fun project as well hopefully next year. It sounds like the arguments against mixing colors really don't apply much to where you live anyway so that is a bonus!
I can't wait to see what kind of offspring you do get from your silkies!
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And it's very, very clear to me that I must begin reading up on Silkie genetics before any of these guys get to breeding age. I have one black bearded silkie hen (named Henrietta) who I'd gotten to be the broody mom for my Seramas but then the older she got, the more beautiful she became and I was convinced I needed to provide her some friends. My little Serama cockerel, Rusty, has tried and tried and tried to mount her only for her to chase him around for a good five minutes until he relents for another few days 
) so I'm gonna try to get some pics in natural light today and I will post them here once I've got them. Maybe we can get some better looks at everyone. She's trying to make some guesses at their genetics and just ordered this gigantic book on chicken genetics so we'll see what happens. I need to share the "Silkies of Other Colors" thread with her so she can see what some of you resident experts have already had to say 
Everyone is looking a lot fatter and fluffier today, including my little Serama!
I weighed my little Serama last night. She was a whopping 9.82 grams! The tiniest chick I've ever hatched. She's made it this far though and she's eating and drinking on her own now so I'm cautiously optimistic about her prognosis!
