hi not sure if this will be any help, but on a christening cake i done which can be found in my pictures, i used a silver dust which worked really well dry just rubbing or painting it on, you can aso add a lil vodka to it and use it wet. works just as well.
Silver Luster Dust either used dry or painted on (mixed with a bit of vodka) works well. Also, silver airbrush food color if you can get it. I have seen the edible silver glaze which is made for fondant, there is a silver food spray that is edible as well.
Ditto on coloring the fondant gray first. I always start with white fondant and add a small amount of either black fondant or black food coloring. It works so much better than dusting it on white fondant.
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