For our metallic buttons, we print directly onto a transparent film. This makes your buttons very special. All white areas in the design will later show the bare metal of the buttons.
If you want a golden button, just use 0%Cyan, 22%Magenta, 77%Yellow and 0%Black.
For all metallic buttons, the print colors are distorted somewhat by the background and the white parts of the image appear in metallic silver. It is not possible to print the color white!