Make a polariscope - you can get magnificent colors using this film and various types of clear cellulose - plastic wrapping film.   Sort of dichroic effect.   Remember to remove protective film from BOTH sides.
 
Optical type: Transmissive
Color: neutral gray
Polarizing efficiency: 99.98%
Wavelength: 400~700nm
Thickness: 0.18mmDirection: linear
Protective film: both sides -
 
**Make sure to remove film from both sides!!***