splathead-
Great question! I did say this was nutty- I need the clear part of the sheet to stay clear while the printed part to go opaque. Do you remember in the encyclopedias that had the pages of the human body. You started off with a body, then you could, by turning the page, remove the skin- then organs, bones and such.
So I thought there might be a method to print on clear plastic witht the white undercoat. Where the white might backup the color.
T