Paper negatives are GREAT for contact printing. They often need to be flashed similarly to halftoning and gloss paper is better than satin or matte as the texture doesn't get in the way. You don't want "black" highlights or "white" darks, keep the contrast as low as possible, OR if that doesn't work, use a lower wattage bulb, farther away when contact printing the final print, OR lightly (do not include in the sqeezed paper neg/paper sandwich) overlary the contact frame with regular butcher paper, mylar, or even clean regular printer paper (depending on size) before exposing. I have used this often for b&w and am trying to perfect a color variation. I'll let you know if I ever get that figured out.