What off-the-shelf can I use as a red, green or blue filter? This is not for laser light source and the light is weak so an absorbing filter can be any material as long as it can filter out specific wavelength ranges. What can I use? Preferrably as a film, or thin plasic sheet (


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As I recall, when I purchased mine years back, I bought something like 2 of each of the possible options, so the minimum shipping charge didn't seem that high.
