Variable color changing light filter

this is a demonstration of polarizers used with light rectifiers or retarders of 1/4 wave or 1/2 wave retarding or rectifying, so the colors are separated in the passing light causing all but one frequency to bang into the other polarizer nullifying all but that one frequency thus making them a single frequency filter for the most part, that can be changed to any range of colors that the rectifier/retarder, and material used in them as well as the material the polarizer is made of, (retarders or rectifiers made with polycarbonate naturally block some UV spectrum due to the blocking effect of the polycarbonate itself, as an example)