Colored 3-D anaglyphs having approximately red or orange, and blue or green-blue element pairs in outline, at least some of the pairs being horizontally shifted relative to each other. The orange outline elements are colored to provide colored pictures that appear to the viewer in three dimensions when...http://www.google.de/patents/US4620770?utm_source=gb-gplus-sharePatent US4620770 - Multi-colored anaglyphs
