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The thickness was probably several
microns (I have nothing to measure the thickness at home).
Why didn't I see any contrast on the white wall?
My red laser pointed made a light spot (diameter about 2 cm with
three well separated diffraction fringes around it) on the white wall,
25 meters away. A microscopic slide was half-covered with a "crystal-
clean polyethylene CLINGWRAP." The thickness was probably several
microns (I have nothing to measure the thickness at home).