If using the ink and paper method, roll the finger on the inking plate or Porelon Pad so that the entire fingerprint pattern area is evenly covered with ink. The ink should cover from one edge of the nail to the other and from the crease of the first joint to the tip of the finger. Using the right amount of ink is of vital importance. Too little ink and the impression will be too light. Too much ink and the fine details will run together.