Out of the samples I have, they don't show off mixing other colors with the silver or gold. I'm assuming it is a similar concept with the clear where there is a max amount of ink coverage you can accumulate before it gets lost in the image. And honestly I'll say the silver and gold aren't anywhere near a foil. It is sometimes pitched as a foil replacement, but I think that is just silly. It could be a good accent if you are doing the right commercial work. This is just my opinion, I'm sure others are quite happy with the additional options.