A new method has been developed for evaluating subjective color shifts of colored objects illuminated by different sources. Each eye is adapted to a different illuminant by being separately exposed in turn by a rotating shutter, with a period of occlusion for both eyes. This method is compared with side-by-side viewing of colored objects in adjoining booths, with and without a septum for separating the eyes. With the side-by-side comparison the eyes arc not chromatically adapted to cither illuminant. With a septum each eye becomes adapted to the source on its side, but neural interaction tends to cause anomalous results. Results, with five observers viewing 34 selected Munsell test chips under deluxe warm white fluorescent lamps (approximately 3000K) and 6000K blue bulb incandescent lamps, showed that hue shifts were much less with the new method. The shifts are in agreement with experience in environments where chromatic adaptation is attained.