The icing would need to be completely removed before serving. Yes I would love to know about the silver luster because i used it on a cake and ate the whole darn thing.... 
I haven't used Wilton's stuff. I know the other metallic dusts are not considered edible in the US. They may be non-toxic but the more realistic looking metallic the less it is considered edible. The heavy metals in them will *never* be eliminated from the body and over time can build up to make you very sick.
I discovered these while surfing.
http://www.countrykitchensa.com/catalog/product.aspx?T=1&ShopId=38&CatId=535&SubCatId=1290&productId=632457
Well that's interesting. I must've known that and blocked it out, about the metallics being non-edible...I'll have to remember that.
Wonder how Colette and some of the others pull off those giant cakes painted completely gold or silver. "Oh--sorry, you can't eat the icing." ??
www.sugarpaste.com has FDA approved edible lusters but i think their silver is more like pearl than silver
I've used some of the lusters that aren't quite as metallic as the non-edible ones - it helps a lot if you tint your fondant the metal color first. The crown on my princess cake in my pics was made from yellow fondant, covered in edible gold dust. I've been on kind of a buying spree with cake stuff, so I don't remember where I got the dust from though!! 
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