i am designing presentation folder with metalic silver texts/graphics on top of the black surface. my question here is what kind of black(for background) should i use when printing. i was advised not to use standard black for the background so, at the moment i am using this cyan black instead (C:20% M:0% Y:0% K:100%) or should i use pantone black c? i wish my color to look similar to color shown n linked image below: