Digital: translucent; for the ink to be visible, pick an ink that is darker than the paper
Letterpress: pushed down into the page with ink; translucent; for the ink to be visible,
pick an ink that is darker than the paper
White ink: an exception to digital printing; opaque and will show up on darker paper
Foil: opaque and will show up on paper that is darker than the foil
Blind embossing: pushed up out of the page without ink; it is better for bold text and images
Blind debossing: pushed down into the page without ink; it works for fine or bold details

Should you pick something that is not feasible, a design consultant will contact you to discuss other alternatives.