If your looking for a place to buy polarizing film for a reasonable price try "www.e-sci.com/genSci/7/1035/1081/W1081.html". I was able to buy only two pieces of film 50mm x 50mm for $4.95. If anyone knows of a better deal or of a place to buy self-adhesive film let me know.
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polarizing film to switch dark characters to light and background to to dark