You can use silver luster dust dissolved in vodka or lemon extract (due to the high alcohol content and the fact that they are clear) and paint it on, just as you do on fondant for cakes. Thin coats, let dry completely before adding another coat. Everclear works even better if you can get your hands on it. I did some kitchen tools this way, I am sure it took at least 3 coats. Helps if you start out with that part of the candy in grey but it's not necessary (I did it on straight chocolate pieces).
Or you can use a single coat of silver cocoa butter, and paint it into the mold before you add the plain chocolate. I got mine from
www.chefrubber.com
Theresa 
Thank you so much ceshell !! I didn't know I can use alcohol on the candy.
thanks for the info
thank you very much Playingwithsugar ,the website has a very exciting items that I didn't know before, but the cocobuter is pricey for me, but thank you very much
Just take it slow and be patient. I remember having some trouble at first but that was 2 years ago, and I think I am recalling trouble getting the COLOR (gel paste) on because I was using water-based colors rather than candy colors to paint. Desperately trying to access my memory-banks () I think the paint went on fine, but you must use thin coats like I mentioned before. I don't think I had everclear at the time so I probably used lemon extract rather than vodka. Go with whatever has the highest proof.
You don't even need to mix your dust with anything. Just brush it on dry. You'll get the best coverage with HIGHLIGHTER dust. Make sure your pieces are at room temp. Don't try to brush the dust on right out of the frig. The condensation will cause problems.
Be sure to tint your chocolate grey first. It will take the silver color beautifully.
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