Tintype Rubbing Eli Sie FOE Asian Calibration Strew: Mal Priers Assembly Operation steps: Step Open daylight plate, and place 2-3 drops of distilled water on the main prism. Close the daylight plate so the water spreads across the entire surface of the prism without air bubbles or dry spots. Allow the samples to temperature adjust on the prism for approximately 30 seconds before going to step #2.