Abstract: In this experiment the haploscopic method was used to test the changeof color vision after illumination of different colored lights. The colorshifts were measured and shown on the CIE 1931 color diagram. It was found that colored lights similar to adapting colors took thesame color appearance of white light. The results also showed that, afteradaptation to an adapting colored light, a white light appeared to have ahue complementary to that light. These results may provide clues to fur-ther our understanding of visual process.

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