Hi there everyone! I am extremely new to cake decorating ( I haven't taken any courses yet ), and I am making a Dallas Cowboys groomsman's cake for my brother in law's wedding in a few weeks. My question is, what is the easiest way to get my buttercream icing to look silver? I read somewhere to mix a few drops of black coloring with a few drops of royal blue. Is this correct?

You cannot acheive a metallic with food coloring. What you can do, is dye the buttercream gray. The only way to get a metallic silver is by using a silver luster dust.

Do you mix the silver luster dust into the buttercream? Are all the metallic dusts created equal?

No, you will need to paint, by hand or spray, the luster dust on

If you have access to an airbrush you can buy silver airbrush color (and there is some also in an aerosol can) which can be sprayed onto BC and give the metallic finish.

even if you don't have an airbrush, the silver airbrush color is one of the quickest ways to get a true metallic finish. Just paint it on with a paint brush. (once your buttercream has crusted)

I'd go with the gray buttercream and either airbrush it silver or super pearl over the gray.

I think it'd take a whole lot of luster dust to mixed it into the BC to get that color and it's more luster dust than I, personally, would like to see anyone actually consume.