Sizzix embossing plates

[ohMom]

i have a Big Shot and a few Sizzix embossing plates. now i love them they are adorable; but is there a trick? Running it through once with the attached plastic 'envelope' and it's very faint. If I double on the 'envelopes' the emboss is popped up good and looks GREAT but there is a faint impression of the square plate of the design.

is this just a paper issue? do you find the designs show better on dark or light colors?