Review on American Paper Optics Polarizing Film by Raymond Iglesias

This product works as advertised but scratches easily and in my use scratches render it unusable. I scan thin slices of minerals sandwiched between two polarizing sheets placed at right angles to each other. Some minerals "distort" light so that they become bright and visible when scanned, while other minerals that do not refract light remain dark. Scratches on the film allow light through and create bright, distorting streaks on the scan.