Actually this is what it says:
"for a dueling blade you have a whit LED and remove the film inside the blade lightly paint it black for a show blade make the blade and paint one side black with a white LED " The later show blade is what he shows in the picture you posted. The previous would block out the light that is transmitted down the tube only allowing the light that pipes down the edge of the blade to be visible.
The Polarizing film is what he shows wrapped around the exterior of the tubes on the post you just linked. If you continue on the saber forum post I believe their is an example where someone took a PC round ripper blade and put the polarizing film on the inside and called it a dark blade or something like that. The polarizing film will work for the effect if you can find a way to protect it with an outer sleeve of PC. Perhaps a wrap a 3/4" PC tube with the film and then insert that into a show blade, assuming it would fit.
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