Means Filters

The red filter passes a lot of green, at least 40% and at least 10% blue. The blue filter passes a little red which turns the purple. Can not get no ghost image on an LED monitor. The effect is there but is very tiring and is squinting because ghosts. The result is slightly better on a CRT but provided significantly increase the contrast to the green and blue for a little, but then ghosts can appear blue filter side depending on the quality of anaglyph which look.

Some anaglyph on the net seem to have been made specifically for these filters and give a stunning result, but it does not work very well with Nvidia 3D vision.