The opaque paper By installing light box, 1 x 1-inch sizes with paper opacity for overlay on each light box until you can't see the light from a light source, count of paper used.
The opacity of the paper By installing a light box with a 1 x 1 inch size paper looking for the opaque channels overlaid on each sheet until light, invisible light from the light source. Count the number of sheets of paper used.
Opaque of paper made by installing the light box is sized openings 1 x 1 inches The paper wants to find the opaque overlaid on a light box one by one until the invisible light from sources sheet of light Count the number of sheets of paper are used