I am trying to make a "keg" cake. I iced it in white bc, then painted it with silver luster dust mixed with some lemon extract. It didn't look silver, just gritty. Then I added a touch of black to the dust/lemon combo and painted that on, and it turned a bluish color. What SHOULD I have done?Is there anyway, at this point, to make it look silver like a keg? I have to leave here in 40 minutes with the cake, PLEASE HELP!!